New Frontier Armory Lower Receiver

[blazein]

I repin with non rotators is this incorrect

 

[FrankT]

I don't know now, first i buy them complete. But over at 6.8 they all use standard LPK's in the omni and NRA stripped lowers, use all metal with no issues with all calibers but I would defer to Matt's suggestions. I am a put together guy not a builder

 

[MIAMI MATT]

No, standard LPK's that are metal will work just fine in poly lowers just when you mix poly and metal parts in the trigger groupings you do not always get standard function, not that it's not fun to dump a mag or go two shot burst when your secondary doesn't engage on your disconnect or but the ATF frowns apon it...

 

[FrankT]

OK, well I leave the NFA group in mine, they are better than any mil spec. Also I did find out recently that for a low price NFA will sell you a thin hammer to use on 22 and 9mm uppers for blow back issues.

 

[MIAMI MATT]

I actually prefer the poly trigger groups feel to any metal one from any brand LPK'S.

 

[ksenter]

I will gladly trade you a poly trigger group for a metal trigger group. The poly group, even with the thinner trigger, will not work with my chiappa upper.

 

[Patoz]

Ok being new to AR builds I have a question about my recently acquired lower from the group buy. From what i understand it is a mil-spec lower. Understand all mil-spec LPK's fit with minor modifications if any. Now my question is does a mil-spec buffer tube fit it? From what ive read the per-assembled Lowers from NFA come with a commercial spec tube/stock.

I guess my 2nd question is what is the major difference between a commercial spec and mil-spec buffer tube? From what i saw online the commercial spec tube is extruded whereas a mil-spec is forged.

Thanks in advance for any guidance..

When I first started, this was one of the first questions I had also, so I researched it and saved my findings. I hope this will help you also.

The main difference is the size specs. They are both made out of extruded aluminum.






Another difference is the type of threads used (cut vs. rolled or truncated), however the OD is the same, as you can see in the diagram below. The threading provides additional support on a mil-spec extension and are larger because they are cut out of a raised portion of the material, where commercial threads are cut on the tube, with the same thickness as the overall diameter of the tube.

Since both extensions have the same diameter, number, and pitch threads, they will both fit a mil-spec receiver. I have several of both and have swapped then back and forth. However, you MUST match the stock to the corresponding 'tube' diameter. A Commercial stock on a mil-spec extension with be sloppy, and a mil-spec stock will not fit on a commercial extension.

The mil-spec extension is also shorter to accommodate body armor, whereas the commercial extension is longer and angled more like a traditional rifle stock. Also, they both have an ID of 1", so the same springs and buffers will fit either as far as diameter goes.

With all of that being said, here is a slightly different take on a few of the points: http://www.ar15.com/forums/t_3_12/564742_.html

 

[Patoz]

Correct sir do not mix plastic with metal .Billet and forged mesh all day. And in my opinion I use the Moe stocks as they are only lacking the secondary unneccisarry locking clip and you save forty bones.

Matt, I have both also, but prefer the CTR over the MOE. It's worth the extra money to me to get rid of the loose fit inherent with the MOE, and get a rock solid stock the CTR provides. That's just me, but I'm sure it helps with accuracy also. Besides, the CTR comes with a built in QD sling attachment point which I use on all of my slings.