re: Official AR-15 thread

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I imagine the trick is going to be getting the receiver in a good vice and of course keeping the bit cool and taking my time.

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And the jig, baw. Make sure you get a jig with good reviews, and, if possible (I know with all the makers out there) one that has confirmed success with your 80% lower. The jig tells you what to remove and what to leave.

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I think I'm gonna try one of these 80% lowers. I have a drill press and router. All I'd have to buy is the jig. If I frick it I'm not out much cash.

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I used the 80% arms Easy Jig. Pretty easy. Highly eccomend spending the money on their end mill as it has a short length of cut which makes it easier tobuse with the jig. Also if you post a review on a forum they will send you a free billet lower.

A)Thank yall for answering a ton of questions in this thread, I've learned a ton

B)So looking into building an AR pistol. Well really I'm just looking at everything. So from what I have read a 7" barrel or 7.5" barrel is too short to be reliable, not really sure I understand why, but something about the length making the gun not cycle sometimes... Would yall recommend a 10" barrel, or would 7.5" be ok?

Also sometimes on these AR pistols you see these huge muzzle brakes like this



What purpose does this serve? Reduce noise or recoil? I understand the noise/shock from these shorter barrels can be pretty wild.

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What purpose does this serve?

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Primarily to manage recoil/muzzle rise. It will make your SBR or pistol a flamethrower. I doubt it does much for noise. Shorter barrels are just going to have more flash, flame and noise, all other things being equal.

I just built my first pistol about 2 weeks ago. I'll share the cliff notes of my research that may answer some of your questions.

If you are going to build a 5.56 chambered pistol, you do need to choose your barrel length/upper carefully. By most accounts, you should get a gas piston system for anything sub 10". Like you said, anything that short with a DI system will not function reliably due to lack of sufficient back pressure required for cycling (something like that at least). The piston systems do not have these problems even at 7.5".

As for brakes and muzzles, it depends on your tastes and preferences. That cookie cutter and something like a Noveske Flaming Pig will divert all flash and gas forward, which makes for a nice little fireball. Those and many others will also make your range time easier for others to bear if you're rocking a 7.5" 5.56 pistol or SBR...they are loud as frick!

I used an Adams Arms 7.5" Evo upper in 5.56 for my build. Don't have any pics of mine uploaded right now but it is similar to this:

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they are - by most reports - just a helluva lot of fun at the range

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right, thats kinda my motivation for wanting to build one, just seems like fun!

so with the SBR talk, what would really be the main difference between and SBR and a pistol? obviously the SBR will have a stock and the pistol will not, but if you build an AR with a 10 inch barrel and a stock, that is an SBR correct? If i built an AR with a 10 inch barrel and no stock that would be a pistol correct?

why go through the trouble of getting the stamp and all that for basically the same gun but one with a stock and one without? basically, what are the advantages of an SBR, seems like you would have the same drawbacks of the pistol with the short barrel... Am I missing something there? I think I am...

What rounds are tailored for the pistol?

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on top of the stamp and I cant really see when I would need one

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Need one? Probably not. Do they make every aspect of shooting more enjoyable? Absolutely.

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Need one? Probably not. Do they make every aspect of shooting more enjoyable? Absolutely.

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maybe ill set up the trust, just not in any hurry to do it, I've got other things Id prefer to spend the money for the trust, stamp and suppressor on, hell I could build a whole rifle. I'd like to get all the rifles I want done before I start adding suppressors and what not. But if one of those is an SBR, I guess I'll need to get all that done anyway. We'll see, maybe i will

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If this is just a toy where all you're concerned about is going to the range and blasting ammo and making noise then the pistol will be fine.

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If you want to make a pistol consider making a pistol caliber instead of 223. The pistol in my avatar is a 22lr and is extremely fun to shoot. If I had not made a 22Lr I would have made a 9mm AR. Both are much cheaper to operate and your neighbors on the range will not hate you.

If it is chambered for 5.56 and .223 wylde, it can shoot 5.56 and 223 safely. I use 55 grain for plinking. I use 77 grain OTM for hunting hogs and deer. I use 70 grain TSX for home defense and hunting as well.