Skip to comments.AR-15 Piston conversion question
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?
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.
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 !
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.
As to what brand to use, since I abandoned the idea, your own research awaits.
FN FAL - piston by design
What are you using it for that you think a piston rig would work better than the original design?
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.
That is all.
This is probably going to be the best place to ask...
You will probably need a roller cam from POF because pistons tens tend to require more force to chamber imo.
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.
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.
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.
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.
wimpy = Wingy ;^)
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.
Any experience with Huldra ? (IIRC, they’re made by Adams)
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!
Aren’t most of those piston rods stainless steel?
I wonder how a nickle boron coating would work if applied to it?
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.