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AR-15 Piston conversion question
04/05/14 | Self

Posted on 04/05/2014 7:55:40 PM PDT by Blood of Tyrants

I have been thinking of putting a piston conversion kit on my AR-15. What brand have you used and what is your experience?


TOPICS: Hobbies; Miscellaneous
KEYWORDS: ar15; banglist; conversion; piston
Any Freepers out there who have converted their AR?
1 posted on 04/05/2014 7:55:41 PM PDT by Blood of Tyrants
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To: Blood of Tyrants
I have done three: an Adams Arms, a CMMG, and a Osprey Defense. If you want the most versatile, use the Adams Arms since it can be turned off or turned down for reduced gas. It is also very easy to clean since the psiton and rod come out the front and then get cleaned and reinserted.

The most trouble free is the Osprey Defense, with a piston cup and rod which are darn near self cleaning with modern ammo. I'm into the second thousand rounds with the Osprey and yet to clean it or have any glitches.

The CMMG is a good system, allows easy conversion to .22lr ammo, and cleans up nice. But of the three I would go with the Adams Arms for ease of use, or the Osprey Defense for easiest conversion. I have the CMMG on an AR pistol with eleven inch barrel. It took a tiny bit of tweaking of the recoil spring to get it to run flawlessly.

All three of my conversions were on carbine length gas systems. I would recommend the Adams Arms for sure if you have a mid-length gas system ... most trouble free recoil action.

2 posted on 04/05/2014 8:06:19 PM PDT by MHGinTN
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To: Blood of Tyrants

I purchased a Sig piston gun and love it for 3 gun competition. Never converted one myself yet friends seem to be using Adams Arms uppers. Not sure of brand for “conversion” so will just bump this thread to the top for ya....

Stay safe !


3 posted on 04/05/2014 8:10:09 PM PDT by Squantos ( Be polite, be professional, but have a plan to kill everyone you meet ...)
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To: Blood of Tyrants

BTW, the OSprey uses your gas block. Just remove the retainer pin holding the gas tube and insert the Osprey tube with piston cup for the piston. With the other two you have to use their gas block because of the proprietary fitting of the piston rod and piston through the gas block. While not difficult to do, some folks have ‘mystery’ malfunctions, usually due to not getting the gas block perfectly aligned when changing out the gas blocks.


4 posted on 04/05/2014 8:10:12 PM PDT by MHGinTN
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To: Blood of Tyrants
I asked pretty much the same question a few months ago, and got hammered. And true, after much more research, I discovered that the advantages of a piston system were overblown and the disadvantages of a DI were also overblown. The best advice was to buy a complete upper already converted or convert yourself then you have both types to judge.

As to what brand to use, since I abandoned the idea, your own research awaits.

5 posted on 04/05/2014 8:13:34 PM PDT by Wingy
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To: Wingy
I discovered that the advantages of a piston system were overblown and the disadvantages of a DI were also overblown.

Agree.

6 posted on 04/05/2014 8:29:45 PM PDT by Red Steel
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To: Blood of Tyrants

FN FAL - piston by design


7 posted on 04/05/2014 8:43:55 PM PDT by Noumenon (Resistance. Restoration. Retribution.)
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To: Blood of Tyrants

What are you using it for that you think a piston rig would work better than the original design?


8 posted on 04/05/2014 8:47:06 PM PDT by Dead Corpse (Tre Norner eg ber, binde til rota...)
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To: Wingy

Get an AK & an AR, then you can have what you want on any given day at the range.

My favorite is the one I happen to be using that day.


9 posted on 04/05/2014 8:54:14 PM PDT by ChildOfThe60s ((If you can remember the 60s.....you weren't really there)
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To: Blood of Tyrants

www.AR15.com

That is all.


10 posted on 04/05/2014 9:09:02 PM PDT by JParris
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To: Blood of Tyrants

This is probably going to be the best place to ask...

http://www.ar15.com/forums/f_3/126_AR_Piston_Systems.html


11 posted on 04/05/2014 9:56:06 PM PDT by Thunder90 (All posts soley represent my own opinion.)
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To: Blood of Tyrants

You will probably need a roller cam from POF because pistons tens tend to require more force to chamber imo.


12 posted on 04/05/2014 10:15:53 PM PDT by lavaroise (A well regulated gun being necessary to the state, the rights of the militia shall not be infringed)
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To: Wingy; Red Steel; Noumenon
I bought a stag model 8 a while back. Looking forward to shooting it this summer. I own several DI weapons too and used them exclusively in the service of course. They would get dirty. They would jam up from time to time. That's what we had S.P.O.R.T.S. for. Occasionally, that wouldn't even clear it. Cleaning that chamber out after a lengthy field training exercise was always a PIA. I think DI is not well suited for certain applications. For others situations, it works better than a piston or so we're told so it depends on what you want to do I guess.

All that being said, I have moved beyond the DI vs. gas piston dilemma to the PTR91 versus DSA FNFAL dilemma because after much deliberation on the matter I have come to the conclusion that DI versus Gas piston is irrelevant because, either way, the weapon is still chambered in 5.56 mm and 5.56 mm sucks as a combat round. There's just no getting around it.

13 posted on 04/06/2014 12:52:54 AM PDT by RC one (Militarized law enforcement is just a nice way of saying martial law enforcement.)
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To: Red Steel

I came back from putting about 400 rounds through my Sig 516. (piston) Went to clean it and it only needed a wipe down. Enjoy that DI system.


14 posted on 04/06/2014 7:04:41 AM PDT by Patriot365
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To: Patriot365

That’s fine. I may get a piston system sometime. I just agreed with wimpy. You may have problems shooting steel cased ammo out of it.


15 posted on 04/06/2014 1:04:06 PM PDT by Red Steel
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To: RC one

Right .308 is a better round than 5.56mm any day. But there are reasons that nations don’t field big battle rifles as their main issued rifles like FN FALs, M14s, G3s and alike ...like in their heydays.


16 posted on 04/06/2014 1:10:52 PM PDT by Red Steel
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To: Red Steel

Ooooh,

wimpy = Wingy ;^)


17 posted on 04/06/2014 1:14:19 PM PDT by Red Steel
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To: Red Steel
there are reasons that nations don’t field big battle rifles as their main issued rifles

Weight is more of an issue for such soldiers, especially when they're wearing body armor along with the rest of their gear. I am not so encumbered however.

18 posted on 04/06/2014 2:41:23 PM PDT by RC one (Militarized law enforcement is just a nice way of saying martial law enforcement.)
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To: MHGinTN

Any experience with Huldra ? (IIRC, they’re made by Adams)


19 posted on 04/07/2014 10:33:54 AM PDT by TurboZamboni (Marx smelled bad and lived with his parents .)
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To: TurboZamboni
No, not a minutes worth. I had thought of obtaining a Huldra 5.45 upper for one of my AR lowers, but the price was too high when I can build one myself. Now that 5.45 7N6 ammo is on hold by Fedzilla, the cost savings over 5.56 is no longer part of the calculus. Besides, I have a nice Bulgy in 5.45 now.

The 14.5 inch 5.56 with Osprey Defense piston kit is an amazing tool. I may pull it out and clean it now just for the fun of it ... I have over 1000 rounds through it without cleaning it. No glitches yet, since I tuned the recoil spring. The cost of ammo has put a severe restriction on my shooting. I am a member of a nice rod and gun club (Unaka Rod & Gun) but have built a small range in my garage because my shooting is now down to 9 x 18 and .22lr, and I'm getting low on .22lr!

20 posted on 04/07/2014 10:46:54 AM PDT by MHGinTN
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To: MHGinTN

Aren’t most of those piston rods stainless steel?

I wonder how a nickle boron coating would work if applied to it?


21 posted on 04/07/2014 11:42:52 AM PDT by TurboZamboni (Marx smelled bad and lived with his parents .)
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To: TurboZamboni

probably quite well. The Osprey is darn near self cleaning as it is, in stainless steel. The cup (kidney shaped cylinder) and piston (kidney shaped insert into the kidney shaped cylinder) are coated and shed carbon like a duck’s back.


22 posted on 04/07/2014 11:54:51 AM PDT by MHGinTN
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