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Posted: 2/12/2013 10:15:50 AM EDT
I plan on buying a Gas Piston Upper in 5.56 in a few days. I have the option to get a 10.5" or a 14.5" with a pinned flash hider to make it 16". I already planned to build an AR Pistol while I send SBR paperwork out. I have a 10.5" complete GI upper that I was going to use, but now I am thinking of selling that upper and doing my SBR as the Piston upper. My question is what would you all do? I really only planned to do one 10.5", so should that be GI or Piston? Is there a benefit to having a 10.5" Piston Rifle over the pinned 14.5" or vise versa? Thanks.
Link Posted: 2/12/2013 10:41:40 AM EDT
I'm a DI guy, but if I did a piston, it would be very short. The longer the gun gets the less benefit you get (even theoretically) for having a piston.
Link Posted: 2/12/2013 11:44:30 AM EDT
[Last Edit: 2/12/2013 11:44:30 AM EDT by VA-gunnut]
Topic Moved
Link Posted: 2/12/2013 1:06:17 PM EDT
Originally Posted By Combat_Jack:
I'm a DI guy, but if I did a piston, it would be very short. The longer the gun gets the less benefit you get (even theoretically) for having a piston.


When you start going shorter than 14.5" and/or running suppressed the benefits/reliability of a piston system starts to shine. That being said there are a ton of guys out there that have had no problems with their 10.5" DI. My 11.5" DI has been flawless. YMMV.
Link Posted: 2/12/2013 5:19:39 PM EDT
I appreciate the 2 responses and hope for more. I currently have a GI Daniel Defense 16" rifle. I planned to have a 10.5" SBR once I send paperwork out and in the meantime I will run it as a pistol. I also planned to have another 16" or maybe 18". I wanted to have a gas piston as one of these options. It sounds like my SBR should be the GP by what you guys say. Thanks
Link Posted: 2/12/2013 6:08:19 PM EDT
If you already have a good upper you should just use that.
Link Posted: 2/13/2013 2:26:41 AM EDT
A 10.5 gas piston SBR depending on the piston maker will have a little less flash/muzzle blast than a shorty DI gun due to the way the gas vents. So a piston shorty can be a little softer shooting than a DI counter part.
A 14.5 pinned gun you can take to any state without the SBR hassle and still is a 14.5 barrel that looks cool but little more practical than a 10.5.
Two pinned 14.5 one 10.5:
Link Posted: 2/13/2013 1:11:46 PM EDT
I have a Adams 14.5 with a pinned Spikes Dynacomp...3-1 gun runs flawless an no SBR paperwork..
Link Posted: 2/14/2013 9:56:59 PM EDT
I have an Adams Arms 10" piston upper on a pistol....no tax stamp either.

Link Posted: 2/15/2013 1:46:02 PM EDT
The 14.5" pinned looks nice and so does the 10" pistol. I am waiting for the shop to get their 14s back in stock from getting pinned. Then I will compare the two and decide..I guess. I should just get both, but don't have that much now.
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