Parts interchange chart/sticky

[FireMoth]

Does anyone know of, and have access to a chart that indicates parts compatibility between .308 AR manufacturers?
If such a thing doesnt exist, who here is a spreadsheet wizard, who we can start compiling data with?
More and more of us are building the big AR rifles, and the "almost dpms" or "almost KAC" compatibility doesnt quite hack it.
So, if no one has done it, how do we as a forum get it started?
For the record, im practically a downy when it comes to spreadsheets. I just come up with ideas :-)

[Rhino0427]

In my discussions with Colorado_Hack, he explained that a good rule of thumb follows: DPMS is 90% of what's out there and will almost always work with other DPMS. On the other hand, Armalite is the other 10% and will only work with Armalite. I understand that this is an oversimplification and sometimes basic manufacturing processes might require some gunsmithing to make different manufacturers work together, but that's all things. We're working on a build right now that is a Frankenstein's monster (albeit a damn pretty monster) of: Precision Aero, Odin, Ranier, POF USA, and other players to be named later...I'll let you know if we have any issues beyond normal

[ray1970]

Hell, I'm pretty sure even DPMS used two different height upper receivers. The lack of standardization on the AR10 parts really makes it hard for me to get into the platform.

[Rhino0427]

Hell, I'm pretty sure even DPMS used two different height upper receivers. The lack of standardization on the AR10 parts really makes it hard for me to get into the platform.

Now that you mention it, that does ring a bell, but I can't say for sure. The interchangability thing is a big deal when you are "all in" for the 5.56 AR system where plug and play is something of a no brainer. However, I really like the .308 ballistics, so I'm taking the plunge...

[Joe_K]

6098660987

This is a mess!

D.I. Rifles and Parts Manufacturers

DPMS pattern LE. 308(s)
Including the new Gen II short reciever
Armalite AR 10 type (s)
RRA LAR. 308's
S&W MP 10's
Daniel Defense 7.62x51 AR
LMT
CMMG (where does the MK 47 fit?)
AERO
LaRue
PSA .308
Noveske
Ranier
KAC
KaK Industries


Piston Rifles and Parts Manufacturers

Colt 901?
Ruger 762
P.O.F
Sig 716
H&K MR 762

I don't have the funds or the time to figure out what will work with what.



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[brutal]

6098660987

This is a mess!

D.I. Rifles and Parts Manufacturers

DPMS pattern LE. 308(s)
Including the new Gen II short reciever
Armalite AR 10 type (s)
RRA LAR. 308's
S&W MP 10's
Daniel Defense 7.62x51 AR
LMT
CMMG (where does the MK 47 fit?)
AERO
LaRue
PSA .308
Noveske
Ranier
KAC
KaK Industries


Piston Rifles and Parts Manufacturers

Colt 901?
Ruger 762
P.O.F
Sig 716
H&K MR 762

I don't have the funds or the time to figure out what will work with what.



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Piston (2 position)
LWRC REPR

Sig716 is 4 position piston - Off, suppressed, normal, adverse.
BCM Gunfighter CH is not compatible with Sig716
I think they only ting that fits the Sig is buttstocks, pistol grip, and PMAGS. Trigger group, safety are all milspec. Have never tried any other uppers on the lower.

[crays]

308 SPREADSHEET (https://docs.google.com/spreadsheets/d/1kcrHfO2ZvriLn5l-MxUKK_9Db_aQw0rW47o2PYbGiJM/pub?hl=en&output=html)

That's a start.

And there's a lot of good info on the 308 AR (http://308ar.com/category/compatibility/) forum.

[Joe_K]

Did you make that spreadsheet crays?

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[brutal]

I question the accuracy of that spreadsheet.

Armalite current (Sr25 pattern mag) and original(10B - AR10) are backwards...
Sig716P magazine is SR25/LR-308

From Magpul:


Additional commercial rifle compatibility includes the new Armalite AR-10A, Ruger SR-762, Bushmaster .308 ORC, Colt LE901-16S, CORE Rifle Systems CORE30, DPMS, LR308, JP Enterprises LRP-07, KAC SR25, LaRue OBR, Les Baer .308, LMT .308 MWS, LWRCI REPR, Mega Arms MATEN, POF P-308, Remington R-25, S&W M&P10, SIG716, and others
NOTE: NOT compatible with Armalite AR-10B, Noveske N6, Springfield Armory M1A, Rock River Arms LAR8, FN SCAR 17S, PTR-91, HK417 or any other rifles that utilize M14, FN FAL, or HK 91/G3 patterned magazines

[Joe_K]

I question the accuracy of that spreadsheet.

Armalite current (Sr25 pattern mag) and original(10B - AR10) are backwards...
Sig716P magazine is SR25/LR-308

From Magpul:


Additional commercial rifle compatibility includes the new Armalite AR-10A, Ruger SR-762, Bushmaster .308 ORC, Colt LE901-16S, CORE Rifle Systems CORE30, DPMS, LR308, JP Enterprises LRP-07, KAC SR25, LaRue OBR, Les Baer .308, LMT .308 MWS, LWRCI REPR, Mega Arms MATEN, POF P-308, Remington R-25, S&W M&P10, SIG716, and others
NOTE: NOT compatible with Armalite AR-10B, Noveske N6, Springfield Armory M1A, Rock River Arms LAR8, FN SCAR 17S, PTR-91, HK417 or any other rifles that utilize M14, FN FAL, or HK 91/G3 patterned magazines


I believe that Magpul designed their PMAG LR's to be compatible with the widest degree of mag wells, so using PMAG compatibility alone wouldnt determine wether the chart is accurate or not, unless I'm misreading your post above.

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[brutal]

I believe that Magpul designed their PMAG LR's to be compatible with the widest degree of mag wells, so using PMAG compatibility alone wouldnt determine wether the chart is accurate or not, unless I'm misreading your post above.

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My Magpul info was to support my claim that Sig716P is an SR25/LR-308 pattern mag not AR-10.

[crays]

Did you make that spreadsheet crays?

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No I did not. I came across it while researching my build earlier this year. I spent a fair amount of time lurking on 308ar.com and several other sites trying to wrap my head around the process.

If memory serves, that sheet was linked either on 308ar or "the site which shall not be named".

[crays]

I question the accuracy of that spreadsheet.

Armalite current (Sr25 pattern mag) and original(10B - AR10) are backwards...
Sig716P magazine is SR25/LR-308

From Magpul:


Additional commercial rifle compatibility includes the new Armalite AR-10A, Ruger SR-762, Bushmaster .308 ORC, Colt LE901-16S, CORE Rifle Systems CORE30, DPMS, LR308, JP Enterprises LRP-07, KAC SR25, LaRue OBR, Les Baer .308, LMT .308 MWS, LWRCI REPR, Mega Arms MATEN, POF P-308, Remington R-25, S&W M&P10, SIG716, and others
NOTE: NOT compatible with Armalite AR-10B, Noveske N6, Springfield Armory M1A, Rock River Arms LAR8, FN SCAR 17S, PTR-91, HK417 or any other rifles that utilize M14, FN FAL, or HK 91/G3 patterned magazines


I did not build it, nor verify the validity of each line's accuracy. If nothing else, it's a good heads up to anyone researching that the whole .308 AR market is a frigging quagmire at this point in time.

[Rhino0427]

I think its also important to recognize that some manufacturers will also modify parts from year to year like car makers so that a 2014 part may not work on a 2015 model even though its the same manufacturer.

[BPTactical]

Barrel nuts are different as well.

[RonMexico]

My POF lower works with both factory forged DPMS and AP Billet uppers. I did buy the Hogan shim kit for the upper receiver bc POF & Hogan use smaller take down pins, so these take up the slack, but it's too tight to run the rear take down pin on the AP upper, so I used an accuwdge. Btw I get solid/repeatable accuracy out of a 18" barrel.

AP lowers will work fine with a dpms forged upper but there is a notice gap
POF and AP Billet upper = tight... Maybe too tight but it's more of a long range build than a SHTF AR10

also I am going to be re barreling it for 6.5 creedmoore, I'll let you all know if reliability changes

[ruthabagah]

I went the aeroprecision route, a DPMS pattern, and I am quite happy with the result. Except in the early beginning, when i was sent an early prod upper with a hand guard that didn't fit and an out of spec barrel, they seems to now have their act together and they did replace all the parts with excellent quality replacement.

I did order a kak BCG and it's been running flawlessly. One of my 2 upper is equipped with a 18' DPMS SASS barrel, and it's been reliable and allowed me tights grouping up to 300 yards (the max I ever shot with this rifle). The second upper is all AP and makes a great battle rifle.