Gunsmithing ar 15 lower questions

[unluckyjohn]

hey guys im getting ready to buy my first ar15 and i thought it be a good idea for me to build it so i can learn its outs and ins
my qustion is would an ar 15 lower with theses specs

-CNC machined from a 7075 T6 MIL-H-6088 forging
-accepts .154" diameter trigger & hammer pins
-low shelf for RDIAS
-CNC milled manufacturer engravings
-MIL-A-8625F Type III class 2 hardcoat anodized finish with a Teflon overcoat inside and out.

be a good lower?
im only paying 75 or 80 dollars for it

 

[Hellbender]

Re: ar 15 lower questions

It all depends if all the holes are to spec. The specs you listed won't tell you that.

Stick with a better known brand for best luck with that.

 

[unluckyjohn]

Re: ar 15 lower questions

its a Patriot Defense Arms lower on the site they call it a PDA 15
i'm buying it as a black Friday type thing
here's the lower
http://www.patriotdefensearms.com/index....products_id=176

 

[SFC Carpentier jr]

Re: ar 15 lower questions

I have built a few AR's, just recently put togther two lowers. The quailty of parts and also the amount of parts available for AR's is just unbelievable. There are many parts and lowers offered here. You might even find some group buys on some lowers.

 

[hdbiker1]

Re: ar 15 lower questions

Almost sounds like an Aero Precision lower at that price. If it is, in my experience they're gtg.

 

[unluckyjohn]

Re: ar 15 lower questions

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SFC Carpentier jr</div><div class="ubbcode-body">I have built a few AR's, just recently put togther two lowers. The quailty of parts and also the amount of parts available for AR's is just unbelievable. There are many parts and lowers offered here. You might even find some group buys on some lowers. </div></div>
i just looked in the group buys no good deals there was only 1 lower and it was way over my price range

 

[unluckyjohn]

Re: ar 15 lower questions

so this is a good lower? go for it? how can i tell if its mil spec

 

[turbo54]

Re: ar 15 lower questions

Has anyone experienced a lousy lower? I haven't - not to say they don't exist though.

Pre-election, I bought in on 5 doublestar lowers for $50/each and the 3 I've built are good to go. With CNC equipment, there really isnt much to them. Even worn out CNCs can hold tolerances of +/- .005" pretty easily. There aren't many features on an AR lower critical to even .005"!

Sidenote: My two DPMS LR-308s have IMPECCABLE fitment between upper and lower. Best I've seen, and I've been around RRAs, Bushys, LMT, CLE POF and more. The takedown pins fit the holes in my DPMSs with less than .002" clearance, yet the pins slip right through on assembly perfect, plus, there is NO SLOP whatsoever between upper and lower once assembled. That is excellent fit, and goes to show what proper use of GD&T can do in the manufacturing world. Not to mention, hard coat anodizing is both thick (adds between .0008-.002" thickness) and quite variable from batch to batch. I don't necessarily think DPMS is a "premier" AR manufacturer, but they've got they're fit down pat.

 

[Hellbender]

Re: ar 15 lower questions

I've had and seen many bad lowers...trigger pin holes off, magwells too tight, etc., etc.

Stick with Stag, RRA, DPMS, Smith and Wesson, and of course Colt and you won't go wrong, at least if you get a bad one, they will replace quickly.

 

[LRI]

Re: ar 15 lower questions

I think its safe to say a black gun is like a sb chevy motor.

The manufacturing has been so refined its about fool proof. Mistakes happen anytime men operate machinery. That said there's always a chance for a goof, but the % is pretty low. Were talking about a weapon system dated back to the late 1950s. A good indication that it works and manufacturers have it figured out.

Buy with confidence, assemble with care/common sense, and go melt your gas tube in a blaze of glory!

C.

Ps

I personally maintained every weapon system tasked with security at the us embassy in Baghdad Iraq from 06-09.

We had quite a menu of manufacturers in the early days as everything was hand me downs.

Uppers/lowers that rattled like marbles in a can. Gas rings that looked like piston rings with 300k miles, etc.

Still worked! Just run em soppy wet and pull that trigger.

Have fun with your new toy.

 

[Graham]

Re: ar 15 lower questions

The lower is just a housing used to contain the trigger.

 

[unluckyjohn]

Re: ar 15 lower questions

now y'all got me worried i just got 2 ar 15 lowers for 100 dollars
here's the link http://palmettostatearmory.com/1560.php
what should i check when i get them???