MM23 image by H. Hoel of Tactical Advantage. By Thomas T. With the Civilian NFA Weapons collecting market in a continual stage of flux, one thing remains constant. Their almost mythic popularity and desirability are not without pitfalls however, as unless one is well versed in what is available in terms of the mechanics and cosmetics of the available versions, it can come as a rude awakening to discover what one has acquired is not necessarily what one expected!

The fact that these guns, as a class, are some of the priciest civilian legal semi-automatics makes it incumbent upon the owner, or individual considering ownership, to grasp the many significant factors that determine relative value of the vastly different incarnations of these guns.

This the basis for the most confusion, as there were many different routes taken to convert the guns into functioning selective fire full-automatics. These converted semi-auto guns are often surrounded by confusion and misunderstanding, and it is that problem that this article will address in detail. This occurred, after having been initially designed and experimentally first produced in post-war Spain by the Government entity CETME during the periodwith the engineering guidance of Ex-Mauser-Werke employees who had fled Post-War Germany and settled in Spain.

After a hurried initial adoption of the new rifle in by both the Spanish and West German militaries, the Spanish and West German Governments co-operated for a time on the final development and perfection of the basic operating system until it became clear that there existed differing requirements for a new service rifle in each country.

Only when it became quite clear that FN-Herstal was not going to allow a production licensing agreement to take place, allowing for West German production as opposed to direct contract purchase from FN, The differing specifications extant in Spain and West Germany by caused termination of the second joint-development agreement and ultimately resulted in the production of two similar, but different versions of the perfected original CETME 7. Parts and fittings were not fully interchangeable, though fundamentally similar.

Clearly this potential is owed in large part to the soundness of the original concept which allowed an inherent capacity for expansion into differing calibers and applications. Imports of these semi-auto versions were clones of the HK The information available seems to indicate that these new made receivers will be close copies of the original design, though not identical in all respects.

What are my choices? Two basic receiver attachment types. So if we wish to discount these select few fully transferable factory original machine guns on grounds of pricing or rarity we are left with the vastly more common NFA registered conversions of their semi-automatic cousins, which should indicate our choices are narrowed considerably, but unfortunately that is not the case! All conversions are NOT the same, or equal!

Within this framework we will be examining the differing mechanical methods used to perform the conversion of a semi-automatic weapon into a select-fire near copy of the factory machine gun. Two SEF style plastic trigger pack housings. There were other special versions of the basic rifles imported and sold on a very limited basis by HK USA Versions of the. Due to import restriction factors of when they were imported, these guns were originally priced considerably higher than their standard counterparts.

Lets take a long look at THAT statement because the receiver of these conversion guns is often the point of the most contention when it comes to understanding, and defining, a particular conversion method, or its official legal status under the Regulations of the National Firearms Act. To understand the above statement in the context of a converted semi-auto Sporter gun into a mechanically viable select-fire version, one needs to understand how the receiver component is actually manufactured.

Part of the forming process is the punching or indexing of the various holes in the receiver required for assembly, or alignment of the sub-components or assemblies of the completed weapon. For purposes of this discussion, we need to standardize some terminology regarding the fire control components, as even the factory official nomenclature can be confusing at times. The fire control group as mentioned above is composed of two distinct sub-assemblies: the outer grip frame housingwhich can be either of full sheet metal construction or in later versions of a hard plastic molded over an inner metal frame, and the internal sheet metal trigger pack which contains and provides a secure mounting for the individual mechanical component pieces which provide the fire control functions.Stay Connected:.

Phone Orders Browse by Category. More Details Buy. Please wait. Sign Up For Newsletter. RTG Parts was established to provide increased customer access to top quality military surplus parts, magazines and accessories. We are proud to offer an extensive inventory of rare and unusual items as well as select new production U.

Colt AR-15 90's Sear Block Lowers

RTG Parts is committed to keeping prices low while maintaining a high level of customer service. We believe we offer the best combination of value and quality found anywhere in the firearms community. Contact Us Quick View. AK47 7. AK74 5. AK 5. Barrel Components. Bolt and Recoil Assembly. Buttstock and Hardware. Grips and Hardware. Handguards and Hardware.

Fire Control Group. Flash Hider and Muzzle. Gas System. Receiver and Build Parts. AK47 Milled Specific.All trigger packs must have a sear at TSC Machine before conversion to sear ready. If a customer wishes to ship via these vendors, they must use their own account number and do so at their own risk. This conversion was built on customer supplied parts and supplied factory German HK 91 receiver.

Scope, scope mount, and custom fitted case are additional. Price includes required parts subject to availability. Trigger housing will be clipped and pinned. Customer must supply registered sear, factory German 3-position Navy pack, and additional parts required for conversion.

Please contact us for details. Customer must supply registered sear and factory German 4-position burst pack. Built on a customer supplied factory German SP Built on a customer supplied factory German SP89 and barrel.

Built on a customer supplied factory German SP5K. Built on a customer supplied factory German SP5K and barrel. Built on a customer supplied factory German HK This conversion does not include a suppressor.

This is a custom TSC conversion based on a clandestine project. Price includes required parts for installation of paddle mag and grenade ring subject to availability. This conversion includes correct markings. Conversion Only — TSC can build custom projects. Factory 21E carry handle installed. Install registered sear in 3-position Navy pack. Install registered sear in 4-position burst pack. Installation Only of Customer Supplied Barrel. Installation of Paddle Mag Release Only. TSC can build custom projects.

Front French sling hook installed.If you are interested in installing a burst fire control group in an AR it is not only illegal but impossible due to the differences in the fire control group wells--there is no room for the auto sear.

To do so is to create an illegal machinegun and can lead to hard prison time. The Colt 4-way parts are no longer in production and I could not locate a source for the Colt 4-way selector. As of June all the other 4-way Colt parts were still available but without the selector they won't do you any good.

The 3-round burst comes in handy when running a high cyclic rate upper such as 22LR or 9mm. I couldn't find any info on the web about the 4-way kits and it took me forever to track down someone that sold the kits. At least one selector stop must be removed to allow the selector lever to move to the 4th position at 6 o'clock. There's also the issue of the added complexity of the 4-way system and its effect on reliability. The Colt 4-Way Selector Note the filed-down selector stops.

I don't believe it's possible to get these individual 4-way parts from DPMS. For the SAFE position the 4-way selector works the same as all ARs, the selector cam contacts the trigger and prevents it from moving. In SEMI the selector cam rotates the auto sear away from the hammer so auto sear will not capture the hammer. The selector cam also contacts the burst right disconnector's tail locking it out see first photo below. This prevents movement of the burst cam and reduces the likelihood of getting a less than 3-round burst with the first burst trigger pull.

This is different from the 3-way burst fire control group where the burst disconnector is always free to ratchet the burst cam, even when firing semi-auto.

TSC Machine

The semi-auto disconnector is free to move with the trigger so it can capture the hammer and end the firing sequence if the trigger is held to the rear. Note that during a SEMI trigger pull you have to overcome the tension of the burst disconnector spring which adds to the trigger pull. This is different than the 3-way burst fire control group where the burst disconnector is never locked out.

The selector cam also contacts the semi-auto left disconnector and locks it out. Note : The first trigger pull when BURST is selected may fire 1, 2 or 3 shots depending upon the starting position of the burst cam, but all subsequent trigger pulls will fire 3 rounds if the trigger is held to the rear.

Turning Your AR-15 into an M-16

Also, if you release the trigger quickly it is possible to fire less than 3 rounds. If you do fire less than 3 rounds the next trigger pull will complete the 3 round burst. For example, if you pull the trigger quickly and fire only 1 round, the next trigger pull will fire no more than 2 rounds.

In full AUTO the selector cam rotates the auto sear into position to capture the hammer. The selector cam also contacts both disconnector tails locking them out which prevents them from capturing the hammer so the rifle will continue to fire while the trigger is pulled to the rear. The already heavy AUTO trigger pull is even heavier because both disconnector springs are compressed during the trigger pull.

In summarywhen the burst disconnector is locked out you get semi-auto fire. Lock out the semi-auto disconnector and you get burst fire. Lock out both disconnectors and you get full auto. It differs from the 4-way kit in three ways.

A 3-way burst kit uses a standard full auto selector so it has no 4th position, the burst disconnector has no "tail" to ride the selector cam so the burst disconnector is always free to ratchet the burst cam and engage the hammer and the auto sear is slightly different--the 4-way auto sear has a thin, curved selector cam follower. You can convert an M16A2 to normal full-auto mode by following the instructions in the next section.

Burst Disconnector Hammer Hook The BURST position will then function as full-auto because the burst disconnector will never capture the hammer and the rifle will fire as long as the trigger is held to the rear.By AdminMay 30, in Class 3 Firearms. The purpose of the sears is to lawfully to convert the host firearms into legal machine guns. The race to produce machine gun conversion sears ended in May 19, with the Firearms Owners' Protection Act.

This law banned the creation of any more newly manufactured civilian transferable machine guns after May Sears produced after are now deemed 'post samples'. Which manufacturer produced the most reliable sear? There is as much opinion about the quality and collectibility of these friction-type Sears as there are guesses of how many Angels can dance on the head of a pin.

I will attempt to clear up some of the myths. First things first. This is what an original factory Heckler Koch sear looks like. HTA did many registered receiver MP5's.

The Fleming and Qualified Sears, which are virtually identical, were stamped out of ' heat treated high carbon steel ' at the same time out of the same stock.

Qualified Sears: serial numbers have either the letter "K" with three numbers or "H" with four numbers. The pack is registered not the sear and takes all factory full auto internals. Above: Ciener Sears: serial number has 3 letters and numbers. Above: Ceiner Registered trigger pack. Note the marking on the metal SEF pack. Mod Above: Neil Smith registered trigger pack. Neil Smith also produced a registered trigger pack. The advantage of this variation is that it uses standard HK factory parts and no custom made sear.

how to install hk auto sear

The pack will have "Neil Smith" and serial number engraved on it. Around 7, sears. What semi automatic rifles can I put my registered HK Sear into?Stay Connected:. Phone Orders Browse by Category. More Details Buy. HK-AR U. Please wait. Sign Up For Newsletter. RTG Parts was established to provide increased customer access to top quality military surplus parts, magazines and accessories. We are proud to offer an extensive inventory of rare and unusual items as well as select new production U.

M16 4-Way Selector Install

RTG Parts is committed to keeping prices low while maintaining a high level of customer service. We believe we offer the best combination of value and quality found anywhere in the firearms community.

how to install hk auto sear

Contact Us Quick View. AK47 7. AK74 5. AK 5. Barrel Components. Bolt and Recoil Assembly. Buttstock and Hardware. Grips and Hardware. Handguards and Hardware. Fire Control Group. Flash Hider and Muzzle. Gas System. Receiver and Build Parts.

AK47 Milled Specific. AKM Specific. AK74 Specific. Beryl Specific. Tantal Specific. Yugo Specific.Participation Requirements: Valid Credit Card required for bidding approval. Sales Tax: Click here for tax information. We will contact you after the auction to arrange payment and shipping. Bid early! With all the bids we receive there are always many tie absentee bid amounts on the same item. To break the tie between other absentee bidders, we take the bid that was received first.

Read our top 5 bidding tips. Skip To Content Press Enter Catalog Search. Account Login Create a New Account. You have either logged in somewhere else or your session has expired. Please reload the page and login again. Go to Catalog. Got One to Sell? Add To Wish List. Text Reminder. Open Fullscreen. Item Views. Item Interest. Manufactured in Wyandotte, Michigan prior to the registry cut-off, and currently not installed in a host firearm.

While deceptively simple in construction, being an aluminum block holding a steel trip sear and a small spring, it's pre registration status makes it an express ticket to build nearly any configuration or variation of AR, M16, M4, etc. The possibilities are virtually endless, and get a little closer to endless every time a new wave of AR uppers or after-market parts hit the market. And as the sear itself is the registered part, the components of the host gun or the entire host gun can be discarded or swapped at will without worrying about the configuration matching the papers.

Excellent, with some mild handling marks and edge wear overall.

how to install hk auto sear

It has not been function tested, though everything does appear to be in working order. In a market seemingly full of upgrades for the AR, this is quite likely the ultimate accessory for America's most popular rifle. Chapter 44 and 27 CFR part Click here to see keyboard shortcuts. Exits full screen view for items. Moves to previous lot, or moves to previous image if full screen view is enabled. Moves to next lot, or moves to next image if full screen view is enabled.


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