Help me build my next AR

[Moose242]

An open bolt anything is a pair of pliers away from fun-mode

Alternately according to the ATF, my shoes are laced up with a pair of illegal machine guns.

[CJ]

An open bolt anything is a pair of pliers away from fun-mode

Alternately according to the ATF, my shoes are laced up with a pair of illegal machine guns.

Two years after that memo they redefined it as to not make all shoe laces illegal weapons. Lightning fast government reaction time.

[black2002ls]

Just pick up a run of the mill parts kit and polish it up.

Is there a how-to on this?

Sent from my SAMSUNG-SGH-I897 using Tapatalk 2

[CJ]

I guess I could make one

[black2002ls]

I guess I could make one

That would be awesome. However some quick instructions in a pm would suffice for me!

Sent from my SAMSUNG-SGH-I897 using Tapatalk 2

[CJ]

Basically you sand/polish the contact points which removes all the grit from the action (Which is what makes the trigger shitty). Polish the face of the trigger (which if you have the trigger out, it's the machined exposed steel at the very front) That is where the trigger engages the hammer, and that's one of two contain surfaces. You want to hold it perfectly flat on a piece of glass or mirror and use some 800 grit or 1000 grit and work it slowly back and forth until all the machine marks are off the face. Then you can move to a higher grit, or polish. When you polish the face make SURE you use a flat piece against the engagement face (the top portion) as to not round the face at the edge. How sharp that edge is is how clean the break is. On the hammer you'll see an indentation on the bottom, a very small shelf - that's where your trigger sits. you can fold some fine sandpaper up and make sure the crease is sharp, and then carefully work it back and forth to remove the machining marks. This is the other 50% of your contact service. Polishing this is more difficult, I usually flip the sandpaper over and put polish on it, then work it in.

Lastly you can polish the contant points of the trigger/hammer - basically where they ride against the receiver on the pins. sand/polish the sides where they contact. If you get real fancy you can chamfer the sides so you reduce the surface area of contact, but only do this if they fit pretty snug. If they have side play in excess of 0.01" then don't.

Lastly the most noticeable change you can make is to the hammer spring itself. This is tricky and takes some experience as I've found over the years that there any MANY different kinds of steel and tension used in various parts kits. Because of this I no longer do the trigger jobs unless I can feel the spring myself and judge if it's already too weak to reduce. The problem is some of the cheaper kits have much less tension on the hammer spring, if you cut or bend a leg you can cause the hammer to have too little pressure and you get light primer strikes on military ammo. Generally what you do is put a 30* bend in each of the trigger spring's legs, then cut 1 leg off the hammer spring - it will drop the trigger pull from 7-8lbs to 5lbs or so. Sometimes you can get it down to 4lbs. This combined with the polishing makes the trigger a hell of a lot better than factory.

For advanced people you can change the engagement angle of the trigger face. If you notice the engagement face is 110*, not 90* like you would expect. That's positive engagement for safety reasons. If you make that a 90* angle it will remove most all of the creep from the trigger. Sounds really easy, right? No, the problem is most LPK triggers are only case hardened, not completely hardened. Once you make the angle change, you have to re-harden the trigger, and that's a complicated and time consuming process. If you're interest in doing that I can walk you through it.

[black2002ls]

The last part is too advanced for me at this point. I think I will disassemble my lower and have a go at polishing things up. I will get some before/after pics to put together a write up. It would be nice to put together an AR-15 knowledge base here with how-to's and such. Any recomendation on a polish?

Sent from my SAMSUNG-SGH-I897 using Tapatalk 2

[03trubluGT]

I just ordered $430 worth of hockey gear for the oldest child.


I will probably just put this in the safe for a rainy day.

[YALE]

I just ordered $430 worth of hockey gear for the oldest child.


I will probably just put this in the safe for a rainy day.

Make him buy you something swanky when he gets to the NHL.

[03trubluGT]

Make him buy you something swanky when he gets to the NHL.

I told him he owes me a Ferrari, but I'd settle for the AC Cobra kit car I'm going to buy with my retirement severance check.

[ceyko]

I told him he owes me a Ferrari, but I'd settle for the AC Cobra kit car I'm going to buy with my retirement severance check.

Dude it's hockey.

1. It'll be cancelled until 2025 due to negotiations
2. May want to settle with a Z06 or something his first few years

I call dibs on a signed rookie card/jersey if he makes it.