What parts do you need for piston AR?

NEIL75

NEIL75

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I am thinking of building a similar AR to the DDM4 V7, but with piston instead of direct impingement. I have seen kits that will change the operation of the AR to piston from gas but if not for the kit, then what parts I needed to do this? I plan to start with a DD stripped lower (if I can find one), likely a Geissele trigger, etc.

-also-

What would be your best choice for a stripped lower (in the very possible case I don't find a DD)? There are so many to choose from.
 
What thinking process did you go through in order to want to build a piston AR?


The only piston AR's that are worth a Geissele are LMT's and Hk's.
 
When you buy the piston conversion kit, it will come with a new adjustable gas block, the piston rod and a new gas key (or BCG) that you will need to replaced on your existing BCG.
 
DDM4V7 uses the Modular Float Rail a piston system will not fit in it.
If you want a piston AR, get Primary Weapon System AR.
 
I put an Adams Arms piston conversion kit on my DDM4V5. I researched like crazy and this system had the best overall reviews. It was easy to install but there are only 2 free float rails that will fit this piston systemic you want the rail To fit around the gas block. The DD lite rail and the Samson evolution. I also bought the AA light weight bolt carrier. Overall, I'm extremely pleased with the gun now. Shoots so soft and the internals stay perfectly clean.

If I had it to do over I'd probably buy a PWS... I could have got the same results with no hassles. But live and learn.
 
Dietz said:
What thinking process did you go through in order to want to build a piston AR?


The only piston AR's that are worth a Geissele are LMT's and Hk's.
Click to expand...

You're funny.
Keep drinking the cool-aid.

Any AR can be improved with a Geissele. I wouldn't waste my time putting one in a norinco but it would make any AR better and can be removed and used in the next rifle when a person upgrades to a nicer AR.


OP, I own two PWS AR's and my 223 has over 4000 rounds through it with almost no noticeable wear. If you want a piston AR for less than the cost of an HK I would go with a PWS. The long stroke system is super smooth and very reliable. The rifles are also surprisingly light for a piston operated rifle.
 
Dietz said:
It's a solution to a problem that doesn't exist, plain and simple.

The DI system IS piston operated anyway.
Click to expand...

This is something we agree on. The internal piston system of the DI rifle is a great design and is one of the reasons the AR is one of the most accurate semi auto rifles out there.
I own both piston and DI rifles and both are great. Each has positives and negatives but the only negative to the DI system is the gas venting in your face. The claims of cleaner and cooler only make a difference when running high volume full auto. 5 round mags semi auto at a range would require someone to run a couple thousand rounds through each rifle to see any difference.
I don't like my PWS rifles because they are external piston design, I like them because they are built extremely well and have so far been 100% reliable after thousands of rounds.
You're right, there is nothing wrong with a DI rifle. The external piston is just another way to do the same job.
 
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