Anyone polished their AR FCG?

[BIGPAPIGREG]

let us know how it works out for ya

 

[ray22]

Im just worried that changing the hammer spring will make it less reliable with nato rounds as thats all i have.

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The reason it might have light strikes is due to the hammer being a little heavy with the lighter spring. If it does then simply bobbing the spur of the hammer will reduce the weight and speed it up again. Also I would recommend polishing the hammer face and bottom of the BCG. It will help reduce fiction as it cycles.

Govern wisely and as little as possible~Sam Houston

 

[jparks54]

The reason it might have light strikes is due to the hammer being a little heavy with the lighter spring. If it does then simply bobbing the spur of the hammer will reduce the weight and speed it up again. Also I would recommend polishing the hammer face and bottom of the BCG. It will help reduce fiction as it cycles.

Govern wisely and as little as possible~Sam Houston

Just double checking but the spur is what sticks off ths back right lol. The hammer i installed in my father-in-laws rifle was from anderson and was already bobbed. Any bonus to it being bobbed with standard springs?

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[Shotgun Jeremy]

"do the set screw pretravel adjustment"

Would you mind elaborating?

 

[BIGPAPIGREG]

Just double checking but the spur is what sticks off ths back right lol. The hammer i installed in my father-in-laws rifle was from anderson and was already bobbed. Any bonus to it being bobbed with standard springs?

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Would you mind elaborating?

I think both of y'alls questions are talked about in this thread--> [h=3]hey BIGPAPIGREG ?? about JP Spring kits[/h]

 

[rushthezeppelin]

I'd bob the hammer regardless as it speeds up lockup time which is good for accuracy. The spur is merely a relic of the full auto FCG and serves no purpose on a semi.


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[jparks54]

I'd bob the hammer regardless as it speeds up lockup time which is good for accuracy. The spur is merely a relic of the full auto FCG and serves no purpose on a semi.


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What was the purpose it served on a fa? From my under standing the auto sear triped the disconector and the hammer spur didnt touch anything. Dose the slower lock up help the timing or something?

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[ray22]

What was the purpose it served on a fa? From my under standing the auto sear triped the disconector and the hammer spur didnt touch anything. Dose the slower lock up help the timing or something?

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The spur on the hammer was used in the release of the second disconnect in a full auto.

Govern wisely and as little as possible~Sam Houston

 

[jparks54]

The spur on the hammer was used in the release of the second disconnect in a full auto.

Govern wisely and as little as possible~Sam Houston

Even after looking at a couple full auto triger groups i never realized there were two disconects i guess just over looked this part. Thanks for pointing it out.

 

[jparks54]

Was the spur specifically for burst operations? all the trigger groups im looking at dont look like the spur contacts the disconect and every one i see with 2 disconects it says the second is for burst. Im not saying your wrong just trying to learn.

 

[ray22]

It was a feature design with both select fire and full auto.

Govern wisely and as little as possible~Sam Houston

 

[jparks54]

Ok here is the best video i have found showing exactly how it works.

 

[cajunautoxer]

Alg and jp springs

 

[TheDan]

I have done the polish job on my AR. It smoothed it up a bit, but that's all.

Same here. It helps, but doesn't do anything squeezing the trigger 1000 times wouldn't do

 

[grumper]

Was the spur specifically for burst operations? all the trigger groups im looking at dont look like the spur contacts the disconect and every one i see with 2 disconects it says the second is for burst. Im not saying your wrong just trying to learn.

The burst parts are very different from M16A1 safe-semi-auto parts. The burst kit requires 2 separate disconnectors and a wider trigger that can hold 2 disconnectors. One disconnector looks like a regular full-auto one, the other one has 2 hooks instead of just 1. The hammer also has a cam on the side that works with the burst disconnector to limit automatic fire to 3 shots only.

Edit: the video you linked explains the operation of the safe-semi-auto FCG pretty well. The burst one works the same way except after 3 shots the rear hook on the burst disconnector is allowed to grab the hammer instead of the auto sear, ending the automatic firing.