KC.45
Member
All .308 AR designs are NOT piston driven. There are gas guns. Dpms for example.
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What AR rifle in .308 ...
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LebbenB
Member
Actually, Mist wolf is right. It's just a matter of where the piston is located. In the Stoner Expanding Gas System, the bolt carrier group IS the piston, since it reciprocates within the upper receiver. Versus an external piston system that reciprocates over the barrel.
Speaking of AR 308's. I was lucky to find the Ruger SR762 in my favorite LGS. Last week, I was looking around to replace my FN FAL Paratrooper for an AR 308 or a Springfield M1A SOCOM. I handled the Ruger the other day in another LGS and fell in love with it immedialtely. I gave up hope since they were rare. That store gave a lousy trade price for it. I then went to my favorite LGS and asked if she could order a SOCOM. She just said, why don't you just get that instead where she was pointing at the SR762. Immediately I traded it.
It balances very well. So far it has shot well with the folding open sights. I have not chosen a scope. Am thinking of a Trijicon. My only complaint is thet the upper and lower receivers and handguards sratch so easily. Otherwise, it's a keeper. My 12 year old girl enjoys shooting it also.
It balances very well. So far it has shot well with the folding open sights. I have not chosen a scope. Am thinking of a Trijicon. My only complaint is thet the upper and lower receivers and handguards sratch so easily. Otherwise, it's a keeper. My 12 year old girl enjoys shooting it also.
DPMS AP4 LR-308 Panther
I purchased a discontinued DPMS AP4 in 308 for $825. I have tried several handloads but the only one that gives me consistent 7/8" or less groups at 100 yards is: 168 grain Hornady SST with Federal 7.62 NATO brass, CCI large rifle primers and 42.2 grains (Lee dipper 3.1) of Varget. Chronographed average muzzle velocity is: 2427 fps. Although the rifle comes with excellent iron sights, I used a Weaver 3 by 9 X40 for accuracy testing.
I purchased a discontinued DPMS AP4 in 308 for $825. I have tried several handloads but the only one that gives me consistent 7/8" or less groups at 100 yards is: 168 grain Hornady SST with Federal 7.62 NATO brass, CCI large rifle primers and 42.2 grains (Lee dipper 3.1) of Varget. Chronographed average muzzle velocity is: 2427 fps. Although the rifle comes with excellent iron sights, I used a Weaver 3 by 9 X40 for accuracy testing.
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Zerodefect
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Well as long as it's here, the AR10 game has changed a bit:
greyghost01
Member
I had a DPMS lr308 very good shooting went bang when ever I wanted it to, Traded up to the Sig Sauer DMR , Piston driven 18" match barrel. Geissle 2 stage trigger, Its a beast, But its very accurate, It just shoots, That's all I can say, Its an amazing rifle that will not let you down, Its fantastic
The LWRC is also very nice!
The LWRC is also very nice!
Zerodefect
member
Very nice, Zero.
What're the specs on that bad boy?
Not mine. (obviously as I only run Larue mounts) It's a DPMS GenII with a Sampson rail added.
I was about to pull the trigger on one of the Hunter models and add a Sampson rail to it, but then the Ruger PR came out in 6.5 creedmore. Might go Ruger instead.
RainDodger
Member
I kind of like mine.... Rock River Arms LAR-8, 26" heavy stainless barrel, Leupold Mark 4 LR/T 8.5-25X. It's definitely not something you'll carry around in the field though. 
Reloadron
Contributing Member
barnbwt
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Hey OP, buy a Roni.
There.
"It's just a matter of where the piston is located. In the Stoner Expanding Gas System, the bolt carrier group IS the piston, since it reciprocates within the upper receiver. Versus an external piston system that reciprocates over the barrel."
If the Stoner system is piston operated, so is the AG42 and MAS49/56. Heck, even recoil-operated guns are driven by an expanding volume of gas in a cylinder thrusting against a moveable face. All guns are gas-operated, and all gas operations relies on cylinders. Brilliant, and super helpful.
Rather than trying to be clever to score points, the "piston," "DI," "recoil," "blowback" categories are --shock-- intended to help differentiate a large number of diverse mechanisms into groups more easily discussed for purposes of description or comparison. Animal, vegetable, or mineral. In such a mindset, the AR is clearly not a piston gun since there is no protruding rod or driving element located forward of the breech face, thus differentiating it from things like the SCAR or AK or CETME. A far more useful point of discussion than "in reality, all auto-loading guns are piston operated" (well duh; all bullets are pistons)
TCB
There.
"It's just a matter of where the piston is located. In the Stoner Expanding Gas System, the bolt carrier group IS the piston, since it reciprocates within the upper receiver. Versus an external piston system that reciprocates over the barrel."
If the Stoner system is piston operated, so is the AG42 and MAS49/56. Heck, even recoil-operated guns are driven by an expanding volume of gas in a cylinder thrusting against a moveable face. All guns are gas-operated, and all gas operations relies on cylinders. Brilliant, and super helpful.
Rather than trying to be clever to score points, the "piston," "DI," "recoil," "blowback" categories are --shock-- intended to help differentiate a large number of diverse mechanisms into groups more easily discussed for purposes of description or comparison. Animal, vegetable, or mineral. In such a mindset, the AR is clearly not a piston gun since there is no protruding rod or driving element located forward of the breech face, thus differentiating it from things like the SCAR or AK or CETME. A far more useful point of discussion than "in reality, all auto-loading guns are piston operated" (well duh; all bullets are pistons)
TCB
Averageman
Member
You might want to look for the June issue of recoil magazine, they reviewed 3 top tier AR's and seemed to be very fair in the process.
BCM is coming out with a .308 AR and if it is anything like their 5.56 AR's, I would look hard at it, the build some great stuff.
BCM is coming out with a .308 AR and if it is anything like their 5.56 AR's, I would look hard at it, the build some great stuff.
Hey OP, buy a Roni.
There.
"It's just a matter of where the piston is located. In the Stoner Expanding Gas System, the bolt carrier group IS the piston, since it reciprocates within the upper receiver. Versus an external piston system that reciprocates over the barrel."
If the Stoner system is piston operated, so is the AG42 and MAS49/56. Heck, even recoil-operated guns are driven by an expanding volume of gas in a cylinder thrusting against a moveable face. All guns are gas-operated, and all gas operations relies on cylinders. Brilliant, and super helpful.
Rather than trying to be clever to score points, the "piston," "DI," "recoil," "blowback" categories are --shock-- intended to help differentiate a large number of diverse mechanisms into groups more easily discussed for purposes of description or comparison. Animal, vegetable, or mineral. In such a mindset, the AR is clearly not a piston gun since there is no protruding rod or driving element located forward of the breech face, thus differentiating it from things like the SCAR or AK or CETME. A far more useful point of discussion than "in reality, all auto-loading guns are piston operated" (well duh; all bullets are pistons)
TCB
Please refrain from posting erroneous information. The bolt of the AR is a piston and the carrier is a cylinder. It's not about "being clever" it's about properly identifying the parts and what role they play.
Please read more carefully. No one said all auto loading guns are piston driven. What was said is
If you find the discussion of technical detail tedious, please do not participate. If you wish to address what you feel is mistake made in a technical discussion, your point will be better taken if made in a professional, logical fashion. I doubt scorn is "High Road"
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OP if you want to update the thread with what you finally decided let me know. Until then this is done.
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