So whats this about DPMS and Armalite Uppers and odd cuts to the receivers?

[PixelBender]

I hear that certain lowers and uppers have an issue with their cuts resulting in the buffer being exposed.

I'm a little confused as to which way it goes.


Armalite Lowers dont fit DPMS uppers? Or the other way around?

I have a Spikes Multical Lower with an Armalite Upper. Works just fine.

Maybe someone can help explain this as I dont even know what to search on google (or here).

Thanks so much.

[JaeFern]

You may be hearing about the .308/7.62 side of the AR house.

[Rock6.3]

AR-10 (Armalite) and LR-308 (DPMS) have a different shaped upsweep on the top of the lower receiver. This does not apply to AR-15 platforms.

[KaLiFORNIA]

Not for standard AR's..

[CHS]

This is only for .308 AR's.

There are two basic "patterns" out there that .308 AR's follow. DPMS and Armalite. DPMS looks just like a big scaled up AR15. Armalite at the buffer tower area has a straight cut rather than a rounded cut. An Armalite upper will fit on a DPMS lower (but not function), but a DPMS upper WILL NOT fit on an Armalite lower.

There are some even more confusing options out there like LMT .308's follow the Armalite pattern, but accept DPMS magazines. LWRC's LOOK like Armalite patterns, but are totally incompatible with either Armalite or DPMS uppers, but still accept DPMS magazines. KAC also uses DPMS mags with an Armalite style pattern. CMMG makes a DPMS pattern lower that uses HK G3 mags which requires modifications to a DPMS upper.

This all only pertains to .308-based AR's and has NOTHING to do with standard 5.56-based "AR-15's". AR-15's are standardized based on the military's adoption of the M16/M4 platform and are pretty much universally compatible. Armalite and DPMS "AR-15" parts are interchangeable.

[tacticalcity]

Next time just yell fire in a theater! You'll cause less of a panic.

[heycorey]

Picture ... thousand words ... etc ...

[novalondon]

Picture ... thousand words ... etc ...

So, thats the difference, DPMS puts the charging handle on the bottom instead of the top of the reciver....LOL

[novalondon]

Sorry, could not resisit the chance to do it!!

[Bentot]

As far as AR10/308 styles, some knowlegeable Calgunners should make up a list about various lowers' compatibility with uppers and magazines.

I myself is thinking of building one but is totally confused.

[CHS]

As far as AR10/308 styles, some knowlegeable Calgunners should make up a list about various lowers' compatibility with uppers and magazines.

When you shop around for lowers, they will tell you what pattern they use and what magazine they use.

The industry prefers DPMS magazines for sure, and those are the kind that Magpul makes, but the more 'high end' uppers tend to be Armalite pattern.

[JaeFern]

As far as AR10/308 styles, some knowlegeable Calgunners should make up a list about various lowers' compatibility with uppers and magazines.

I myself is thinking of building one but is totally confused.

Just get a MA-TEN set. Will accept DPMS or Armalite barrel extensions. Then do what you want (remember that the rail height for the MA-TEN is a DPMS High Profile unless you don't care if the rails don't match height. I don't personally. The scope rings mount on the receiver for me only anyways.) And they use DPMS magazines too. I beleive there is already a thread with people listing their builds. MEGA Arms site also has compatibility listings for their MA-TEN set as well.

(Top Rifle)Can you tell the Upper Rail and the FF Hand guard rails don't match heights? The FF Hand Guards height is a DPMS Low Pro but it obviously serves me no real function since I don't use iron sights on it... (and yes I know I need to replace the optics on it... it was just laying around and I'm broke so it's going to have to wait...)

[heycorey]

Sorry, could not resisit the chance to do it!!