swpc629
Well-Known Member
I have finally gotten another AR after 30+ years. It is an AR10 in 308. I want to put a different handguard on it. I am wondering if AR10 and AR15 handguards are different in size or are they thecsame?
AR 10 Handguard
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Zen Archery
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Same.
cohunt
Well-Known Member
Not the same, only the gen 2 are the same size as ar-15, the dpms/lr308/sr25/ar10 have larger Diam barrel nut/guard
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Just use a search engine with the words
AR15 AR10 parts compatibility
AR15 AR10 parts compatibility
cohunt
Well-Known Member
We would need to know what "ar10" platform to make sure
backwoodsshooter
Well-Known Member
if it's DPMS Gen 1, no. they are different sizes.
LR308 gen 1… in different than an AR15 hand guard
Same? Not in my experience. My first AR10 build was an Aero low profile (G2) upper/lower. Not a single AR15 handguard that I had would fit. Some wouldn't even pass cleanly over the gas block & tube.
Add to that, I've never seen a handguard listed as "compatible with AR10 / AR15"
Also learned, quickly, that not all AR10 handguards play nicely with uppers. Two "DPMS" compatible uppers, different handguard fittment, may not fit with different lowers.
It's not a milspec platform, so manufacturers do modify some dimensions.
Best suggestion, call the vendor to ensure that the handguard will fit your upper.
Add to that, I've never seen a handguard listed as "compatible with AR10 / AR15"
Also learned, quickly, that not all AR10 handguards play nicely with uppers. Two "DPMS" compatible uppers, different handguard fittment, may not fit with different lowers.
It's not a milspec platform, so manufacturers do modify some dimensions.
Best suggestion, call the vendor to ensure that the handguard will fit your upper.
cohunt
Well-Known Member
Aero precision clouds the water a little with their "gen 2" components---- they are referring to their own 2nd generation of parts that offer more/different features than their fist generation of 308 components. They are NOT compatible with DPMS gen 2 rifles ( which is what is commonly referred to a "gen2" 308)
DPMS Gen2 rifles and componants are mostly property in nature but do use common ar15 barrel nuts and handguards...as far as I know, the only other 308 AR upper that uses ar15 barrel nuts and handguards is the "nextgen" by Harrison Bean --- the design and rights were sold off to a different person located in Colorado that last I heard had rebranded them as the "regulator" BUT I'm not sure he has any for sale at this time.
The "gen2" mixes ar15 and ar10/lr308 components to create a much lighter 308 rifle--- they also use some proprietary parts (such as bolts, extractors, ejector, and barrels)
As others have said, the 308 AR platform isn't really milspec- therefore there are quite a few proprietary components that won't necessarily "cross over" in fitment from one brand to another like with ar15 parts. There are different designs of uppers/lowers, magazines, buffer/spring lengths, barrel nuts, handguards, bolts, etc.
Gotta do your homework before purchasing components for the 308 AR type rifles
My bad for citing "Gen 2", as that alone can be confusing once you get outside DPMS. Didn't Remington kill the DPMS brand?
Back to my point, there's "low profile" "high profile" and then whatever they called it, the small form-factor AR10. As I understand, the SFF AR10 offerings were rarely interchangeable with any other brand, and many designs were full of problems.
Whether you have a high profile or low profile is measured in the thickness of the tang above the charging handle, as shown in the pic from Team 15. Lots of great LR308 build resources out there, like 308 ar dot com.
swpc629
Well-Known Member
The one I have has a Palmetto lower and I can't find anything that says what brand the upper is. I don't thing it is a Palmetto because the bolt will not lock open on an empty magazine. And been told that is a common problem with Palmetto lowers if the upper is not a Palmetto.
cohunt
Well-Known Member
Might be a magazine issue-- have you tried other magazines? Could be the bolt catch also.
Iirc the psa are dpms gen1/lr308/sr25 compatible ar308--- they would use the standard dpms handguards and barrel nuts ( not the tall, but the low style) BUT iirc also, they have a few "small parts" internally that are just a bit different
Aug 2009 was the cut off date for dpms lr308 upper changes-- before that date they were "high" after that date they were "low" --- most lr308/sr25 hand guards will be the "low" style and the most common barrel nut size is 1-7/16"x 16 tpi
If it is a high pattern DPMS, pm me and address and I will send you one for free, it's a good design, just to long for my taste
