Mega Arms AR15 Pistol Build

[JohnC]

this 1
http://slrrifleworks.com/index.php?route=product/product&path=57_103_104&product_id=124

I ordered everything else I needed to finish the build last night. :up:

For the gas system, I ended up going with this setup: http://www.adamsarms.net/pistol-pdw-length-piston-kit-xlp-no-rail

Ever use it?

I hope it doesn't suck. :lol: Edited September 13, 2015 by JohnC

[Dolomite_supafly]

I would search around because I have seen them in the sub $250 range before.

 

Here is one $50 cheaper.

http://www.wholesalehunter.com/product.asp?productid=11089451

 

And the search continues.

http://www.westernsport.com/category-s/1862.htmhttp://www.westernsport.com/category-s/1862.htm

 

You might be able to buy the super cheap "carbine" kit and then just buy the shorter piston direct from AA.

http://www.westernsport.com/Adams-Arms-Carbine-Conversion-Kit-AA-CPS-D-ADA-S-p/aa-cps-d-ada-s.htm

[Johnny Rotten]

I ordered everything else I needed to finish the build last night. :up:

For the gas system, I ended up going with this setup: http://www.adamsarms.net/pistol-pdw-length-piston-kit-xlp-no-rail

Ever use it?

I hope it doesn't suck. :lol:

Nope,

only piston upper I have is my shrike.

I'd be interested now your flaming pig works, nothing like a huge fireball and tracers to get the RO attention.... 

Edited September 13, 2015 by Johnny Rotten

[JohnC]

It sucks having to wait on parts.... I want to finish this build now! :hyper:

[Dolomite_supafly]

Nope,

only piston upper I have is my shrike.

I'd be interested now your flaming pig works, nothing like a huge fireball and tracers to get the RO attention.... 

I run a 4 piece brake which is like a KX-3 on my 7.5" AK. If anything needs flash mitigation it is that gun and it reduced the flash substantially as well as making it less painful to shoot because of the muzzle blast. Normally the muzzle blast forces you to close your eyes but not with the 4 piece brake.

 

I ran a KX-3 on a 13" AR and it made a huge difference on it as well.

 

The only thing I do not like about these types of brakes is it does increase felt recoil because it increases the back pressure which increases the bolt speed. If you are going to run one on an AR make sure to also run an adjustable gas block.

[JohnC]

I run a 4 piece brake which is like a KX-3 on my 7.5" AK. If anything needs flash mitigation it is that gun and it reduced the flash substantially as well as making it less painful to shoot because of the muzzle blast. Normally the muzzle blast forces you to close your eyes but not with the 4 piece brake.
 
I ran a KX-3 on a 13" AR and it made a huge difference on it as well.
 
The only thing I do not like about these types of brakes is it does increase felt recoil because it increases the back pressure which increases the bolt speed. If you are going to run one on an AR make sure to also run an adjustable gas block.

I'm probably going to give this a try later on: http://primaryweapons.com/wp/shop/cqb-compensator/

It looks a little better than the KX5 Flaming Pig actually.

[Dolomite_supafly]

I have a 1/2-28 adapter for the 4 piece if you want to try it.

[Dolomite_supafly]

I will see if I can get a video of my 7.5" AK with and without the 4 piece.

[JohnC]

Piston kit finally came in, snapped a quick pic before leaving for dinner....

Edited September 17, 2015 by JohnC

[JohnC]

Well, after a test fit, I have run in to multiple issues.
 
1. The rod itself is the wrong length. It's too long and would require at least a 10 inch barrel to have enough room for the gas block to sit and still have room for the flash hider.
 

 

 

 

 
2. The gas block won't clear the Daniel Defense Lite II 7.0 rail in the inside even if the rod was short enough to tuck the gas block under the rail.
 

 

 

 
I'm going to contact Adams Arms and get them to send me the correct kit. When they send the correct shorter Pistol (PDW) kit, I'll still have to buy a rail with larger inner diameter to clear the gas block.
 
Other way to fix the issue would be to toss my 7.5in barrel in a box for a future build and get a CHF 10in inch barrel, but that would really put this "pistol" at an undesirable length for me.
 
The only other alternative I have to keep it at 7.5 inches is to buy a whole new gas impingement BCG with gas tube and gas block and then just save the Adams Arms Piston kit for another build.
 
:wall:
 
 
 
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Edited September 18, 2015 by JohnC

[JohnC]

Yup... They sent the wrong length.... My box has Mid Piston System on it.... 
 

Edited September 18, 2015 by JohnC

[JohnC]

Well, Adams Arms stands behind their stuff. They sent me out a Pistol (PDW) rod at no cost and told me to keep the mi-length rod for the trouble (they run $77). :up:

[JohnC]

Another test fit since the barrel and pig finally came in. Sorry for the funky color hue, but too lazy to edit. Lol






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Edited September 23, 2015 by JohnC

[Mark A]

That looks like it is going to be a lot of fun to shoot...

[JohnC]

That looks like it is going to be a lot of fun to shoot...

I can't wait to get it finished up!

Just got to do a couple more things and it'll be done!

I might build my Mega Billet Ambi set in to a 6.8 SPC or .300blk pistol, but still reading up on that. :)

[DT INC.]

Very nice! If it shoots half as good as it looks you should be very pleased.

[jwhjwh54]

looks good!

[JohnC]

Thanks, guys! :up:




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[JohnC]

Rest of the bolt parts came in off back order finally.











Now to find a rail that fits....


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[Ted S.]

Any ideas of what you're looking for in a rail? Or just that it fits the piston setup?

Edited October 1, 2015 by Ted S.

[JohnC]

Any ideas of what you're looking for in a rail? Or just that it fits the piston setup?

Not sure which one yet, but I'm looking for maybe a 7.5 to 8 inch quad rail. It's got to clear the AA XLP gas block and the Noveske KX5, too.

[Ted S.]

What's your budget for it?

 

If you want something really economic, go veriforce: https://www.veriforcetactical.com/product/ar15-free-float-rail-system-with-continuous-top-rail/

 

I have one of their MLOK rails and the quality is fine. The finish isn't the absolue best I've ever seen, but not bad either. No name recognition though.

Edited October 1, 2015 by Ted S.

[JohnC]

Problem is, that barrel nut looks a bit too big. This piston system needs a mil-spec size barrel nut and I think it is something like .90 inches in depth.

[Dolomite_supafly]

Call the manufacturer of the piston kit and see what they recommend. I am sure they answer this question all the time.

[Ted S.]

Problem is, that barrel nut looks a bit too big. This piston system needs a mil-spec size barrel nut and I think it is something like .90 inches in depth.

 

Yeah, it is way longer than 0.90"