Topic: DPMS Receiver Heights (Read 5116 times)

imschur · « **on:** April 06, 2010, 09:20:41 PM »

I recall a DPMS employee on another forum stating that DPMS has changed the height of the picatinny on the LR-308's. I believe this is the 3rd or 4th time this has happened.

Does anyone have specifics? The difference is measured in the area of the receiver over the charging handle.

There are implications to this height change.

98Z5V · « **Reply #1 on:** April 06, 2010, 09:51:12 PM »

There was a thread on ARFCOM about this that I ended up in. It kinda turned into a pissing match of sorts. I'll dig up the details of the receiver heights from that and post them up - one dude on there literally knew everthing about it, much to his credit. Numbers, heights, everything. I'll grab the details.

98Z5V · « **Reply #2 on:** April 14, 2010, 06:30:27 AM »

Info straight from DPMS:

Our AR15 receivers are all the same height except the High Rider and Tri-Mount.

The LR308 Platform has two heights, the A3 and Lo-Pro Raised Rail. The A3 was changed recently to better accommodate our other components. I guess in reality, with the number sold before the change, there are now 3 heights.

To find out if you have a newer model or older run, the easiest way to measure is with a caliper from the bottom surface that mates to the lower to the top of the rail. The new versions measure 2.003 and the old versions are 2.063.

Any larger receiver rail to handguard rail height difference would be due to the lack of an industry standard in the large frame AR style rifles. Everybody is still pretty much making their own thing and some measurements just don't line up between manufacturers.

imschur · « **Reply #3 on:** April 14, 2010, 08:26:34 PM »

Thanks for tracking this down

KellyTTE · « **Reply #4 on:** January 27, 2011, 06:40:39 PM »

So I have one of the new height uppers, does this mean that the JP/VTAC won't be at the correct height when I install it? Its a .063" difference which could be made up with a taller front sight post.

Any input? With the Brownells discount, the JP is a pretty hot deal.

imschur · « **Reply #5 on:** January 28, 2011, 06:55:38 PM »

Correct, if you run a top rail on the VTAC they wont align

guessta · « **Reply #6 on:** January 29, 2011, 11:06:58 AM »

Does anyone know of any company that makes rails for the new A3 height receiver? Will the companies ( Troy, Daniel Defense, etc.) make new rails to fit this new height? Why would DPMS do this? It doesn't make any sense unless they only want you to buy their rails.

imschur · « **Reply #7 on:** January 29, 2011, 11:14:24 AM »

Quote from: guessta on January 29, 2011, 11:06:58 AM

Does anyone know of any company that makes rails for the new A3 height receiver? Will the companies ( Troy, Daniel Defense, etc.) make new rails to fit this new height? Why would DPMS do this? It doesn't make any sense unless they only want you to buy their rails.

I would be surprised if guys retooled just to accommodate DPMS. Too many other guys making uppers now.

Of course a clever manufacturer could make a quad rail with two different heights and please everyone. I also suppose FFHG like a VTAC could have two accessory rail heights

guessta · « **Reply #8 on:** January 29, 2011, 11:37:51 AM »

That's the same thing I was thinking. Making diffrent size accessory rail heights, as I was thinking of going with the 15" PRi Gen III. I hope they do consider this option if any. That would solve my problem but who knows.

imschur · « **Reply #9 on:** January 29, 2011, 11:49:49 AM »

At least for those who assemble their own uppers there is absolutely no reason to purchase a DPMS stripped upper. Lot's of options in 2011.

This does however stink for folks who buy a complete rifle. (Insert a plus 1 Armalite here)

guessta · « **Reply #10 on:** January 30, 2011, 02:57:40 PM »

Just a heads up, I just got off the Troy Industries website and it looks like theynow have the 13.8 battle rail avaialbe for both DPMS receiver heights

. Pretty excited over this. they must have just made it available because I was just in their website 2 days ago and it wasn't available then. Well this is just another option for those of us that have the newer A3 receiver.

TacBlade · « **Reply #11 on:** January 30, 2011, 03:27:00 PM »

That is a good move on their part to address a problem first! They may make a few bucks before someone else jumps on the wagon!!!

imschur · « **Reply #12 on:** January 30, 2011, 03:34:56 PM »

That also may be a sign that DPMS will be offering that option on their weapons.

guessta · « **Reply #13 on:** January 30, 2011, 04:07:57 PM »

Just ordered it. As soon as I get it and put it on I'll let you all know how the fittment is. I'll also post some pics.

308reloaded · « **Reply #14 on:** February 06, 2011, 05:27:36 PM »

this has me confused (easily done) if I check measurement as posted here I have old style receiver if I check method posted on another site " measure tab above the charging handle " then I have new .. will either one make this weapon shoot worse or better?