Piston AR

Silver Fox · Nov 25, 2019

I’m looking to buy an AR that is piston operated, not gas operated and chambered in a 762/308. The Sig 716 looks good to me but I’m also looking at Adcor as well. Anyone have thoughts of either of these two or a different suggestion?

Jimbob2.0 · Nov 25, 2019

T91 The uppers are low cost, its got military heritage and is actually a fairly decent design.

Ill echo many that piston ARs tend to solve a problem that doesnt exist.

smokey · Nov 25, 2019

Why a retrofitted AR being forced to use a system it wasn't designed for when you could go for something like a scar or tavor 7?

Qbeam · Nov 25, 2019

The Sig 716 is a nice rifle, but I don't know if they worked out the proprietary forend and charging handle.

Q

Boats · Nov 26, 2019

H&K MR762?

K31 · Nov 26, 2019

Silver Fox said:
I’m looking to buy an AR that is piston operated, not gas operated

A piston AR is gas operated.

Boats · Nov 26, 2019

K31 said:
A piston AR is gas operated.

Very true.

I assumed he meant DI, but we may never know.

The fact that he wants a piston driven AR at all should tell us all we need to know.

Where is Clandestine when you need him?

omegared24 · Nov 26, 2019

Silver Fox said:
I’m looking to buy an AR that is piston operated, not gas operated and chambered in a 762/308. The Sig 716 looks good to me but I’m also looking at Adcor as well. Anyone have thoughts of either of these two or a different suggestion?

Here's a suggestion. Don't go with an inferior proprietary system. If you want 7.62 go with a gun that was designed to run it.

danb · Nov 26, 2019

I would go with the SCAR or HK, but I would also go with 556 not 762. Much cheaper to shoot. Either will be pricey, both are great shooters. Watch the consignments section of IPs, they get sold from time to time in good condition, but without the "new" premium.

Technically, the bolt of a standard ("Direct Impingement") AR is also the piston, so all ARs are pistons (and they are all "gas operated" too). But I know what you mean.

Dont take the comments personally, Some people think that they are super clever (most people dont know that the bolt of a standard AR is also a piston). Some people here also think technology peaked in the 90s with "Colt" ARs and flip phones.

Bear in mind, "piston" ARs like HK 556 or 716 are much heavier than their DI counterparts. I have a HK556, its one of my favorite rifles and also one of the most accurate. But its much heavier than my lightest AR. SCAR is lighter than the Hk556 by almost 2 lbs. For 762, this could be a blessing rather than a curse as it will absorb recoil.

calicojack · Nov 26, 2019

danb said:
Some people here also think technology peaked in the 90s with "Colt" ARs and flip phones.

What? I guess I need to replace my flip phone.

danb · Nov 26, 2019

calicojack said:
What? I guess I need to replace my flip phone.

lol, yeah I do know someone with a flip phone. cant receive any images.

bkuether · Nov 27, 2019

I started my days on this forum asking the same question. Many told me "you don't need a piston".

I was fascinated and intrigued by "something different".

I got my (Stag left handed) piston AR, and it worked.

Advantages:
-There is no gas being vented into the bcg or upper receiver. It stays pretty clean.

Disadvantages:
-More moving parts, and overall more complex.
-Piston slams back harder than DI gas operation. Heavier buffer required.
-Piston, head, cylinder, spring, all add up front weight, very front heavy.
-Smaller parts and mechanism harder to disassemble and clean.
-Non Standard parts must be sourced from manufacturer.

In the end, I found standard DI ARs to be easier. And even operating left handed they present no issue.

If I had to do it all over again, I would have gotten a DI AR from the start.

I did just have it out again mated to a rifle length stock and buffer. It's better behaved and I am going to "save" it by building a new lower with a Magpul MOE Rifle length stock, tube, and buffer, and get all of the furniture correct. Pics to be posed in the AR Picture thread shortly.

sleepingdino · Nov 27, 2019

Who owns just one gun? Most have plenty of DI AR’s.

There’s a benefit to a piston driven gun with a can.

Sent from my iPhone using Tapatalk

calicojack · Nov 27, 2019

danb said:
lol, yeah I do know someone with a flip phone. cant receive any images.

ok. I am getting an iPhone 11; but I ain't giving up my DI AR

Nothing wrong with a "piston" design if that's what you want.

erwos · Nov 27, 2019

Given the OP's stated requirements, the most appealing option to me is the POF Revolution 308. It's not cheap, but it's one of the best executed, most feature-filled 308s on the market, and is WAY lighter than many other options. Otherwise, I'd run with a SCAR 17S or a Sig 716G2. None of that is cheap, but it's hard-core stuff.

That said, I do agree with the crowd that you can get pretty far a lot cheaper with an Aero M5E1 build.

danb · Nov 27, 2019

calicojack said:
ok. I am getting an iPhone 11; but I ain't giving up my DI AR

Nothing wrong with a "piston" design if that's what you want.

I have em all, piston, DI, and even a few (egads) AK style, and I think debating which one is the "best" is like debating which kind of sex is the best. if one wants a piston rifle, the heart wants what the heart wants.

grimnar15 · Nov 27, 2019

If you want a rock solid piston conversion kit for an existing AR15, then you should consider the Osprey Defense OPS-416. This kit instals in under 20 minutes, is purely mechanical so no little parts that break or get lost, is very light weight, reliable beyond reason and uses your existing bolt and gas-block which does not need to be removed for installation.

Note: Bollinger has a almost brand new Adcor up for consignment.

See OPS-416 videos below:

https://youtu.be/iAeqjSy7_uk?t=45

https://youtu.be/dTjJ2GJmlrU?t=36

https://youtu.be/z3hBXCvYIuk?t=38

https://youtu.be/I5FPaSrxyK4?t=35

vetogunban · Nov 27, 2019

Removed

grimnar15 · Nov 27, 2019

vetogunban said:
Removed

???

danb · Nov 28, 2019

forgot: Faxon also has a piston rifle and upper (ARAK 21). they make great barrels and bolts, but I have no experience with the upper. gets good reviews.

Piston AR

The #1 community for Gun Owners of the Northeast

Member Benefits:

Member

Ultimate Member

2A TEACHER

Ultimate Member

Broken Member

"Part of that Ultra MAGA Crowd"

Broken Member

Ultimate Member

dont be a dumbass

American Sporting Rifle

dont be a dumbass

Judge not this race .....

Active Member

American Sporting Rifle

The Hebrew Hammer

dont be a dumbass

Ultimate Member

Active Member

Ultimate Member

dont be a dumbass

Users who are viewing this thread

Log in

Forum statistics