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Some questions on a new .300blk pistol build


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#1 OFFLINE   Gorrt3907

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Posted Apr. 16 2018 - 06:40 PM

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.


#2 OFFLINE   Gorrt3907

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Posted Apr. 16 2018 - 06:43 PM

And a question, does having a suppressor effect cycling?


#3 ONLINE   Steelborn1

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Posted Apr. 16 2018 - 08:38 PM

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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#4 OFFLINE   Gorrt3907

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Posted Apr. 16 2018 - 09:02 PM

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


#5 ONLINE   bamashooter

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Posted Apr. 16 2018 - 10:29 PM

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.




#6 ONLINE   JohnGaltOU812

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Posted Apr. 17 2018 - 02:37 AM

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.




#7 OFFLINE   Gorrt3907

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Posted Apr. 18 2018 - 10:06 AM

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

Edited by Gorrt3907, Apr. 18 2018 - 10:07 AM.



#8 ONLINE   Longhair

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Posted Apr. 18 2018 - 10:16 AM

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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#9 OFFLINE   gshayd

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Posted Apr. 20 2018 - 07:59 AM

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

 

Set Screw


Edited by gshayd, Apr. 20 2018 - 08:00 AM.



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