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Gorrt3907

Some questions on a new .300blk pistol build

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I'm still new to the forums and can't get the search, so a some of this might have been covered.

 

1. There is no difference in a ar15 upper upper for 5.56 and .300blk.

2. For a 7 or 10.5 barrel. It still uses gas tube not piston.

3. You can still use a carbine buffer system.

4. You can have a angled for grip, not a forward handle grip.

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And a question, does having a suppressor effect cycling?

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1. Same upper receiver.

2. 300blk will use a pistol gas tube for most applications. A 7.5" 5.56 will need a pistol tube and a 10.5" a carbine.

3. Carbine buffer is fine.

4. AFG is ok, a pistol grip is a no no unless registered SBR.

5. Yes, a can will increase gas pressure and can affect cycling. An adjustable gas block is useful in tuning.

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Thanks Steel. I guess they were more statements, then questions

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1. Same upper receiver.

2. 300blk will use a pistol gas tube for most applications. A 7.5" 5.56 will need a pistol tube and a 10.5" a carbine.

3. Carbine buffer is fine.

4. AFG is ok, a pistol grip is a no no unless registered SBR.

5. Yes, a can will increase gas pressure and can affect cycling. An adjustable gas block is useful in tuning.

I thought I saw recently (but not a recent ruling) where specifically, as outline by the ATF, only a truly vertical grip was a negative.

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A forward vertical pistol grip requires registration and tax paid as an AOW unless the overall length of the firearm without the muzzle brake or flash hider included is over 26 inches.

 

See the Franklin Armory XO26 ATF letter.

 

At that point it is also no longer a pistol.

 

Angled foregrips for some reason don't count as a second grip, so those are currently allowed on pistols.

 

Adding a suppressor will cause increased gas pressure and increased bolt velocity. How much impact this has will vary based on barrel length after the gas port, ammo used, size of the gas port, and which suppressor is used. An adjustable gas block is a good addition to tune your firearm to the ammo you intend to use, especially if you intend to shoot suppressed.

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Ok another question, gas blocks. Set screw on clap style??

Edited by Gorrt3907

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Ok another question, gas blocks. Set screw on clap style??

I have one of each on .300BLK builds, and I prefer the set-screw style.

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My advice is don't build a 7.5 " AR pistol.

 

Set Screw

Edited by gshayd

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I'm guessing since you want to have a 7.5" or 10" barrel you'll be using it for CQB probably home defense. So with that, I would advise the 7.5" just for easier maneuverability, plus if you miss you'll give them 3rd-degree burns from the fireball.

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I'm guessing since you want to have a 7.5" or 10" barrel you'll be using it for CQB probably home defense. So with that, I would advise the 7.5" just for easier maneuverability, plus if you miss you'll give them 3rd-degree burns from the fireball.

One way or the other they're "goin' down". :D:

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One way or the other they're "goin' down". :D:

Yessir :snicker: :snicker:

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