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  • #1

    NFA poly lowers?

    Who here has bought them and how's your experience with them been so far? Did you buy the complete lower from NFA with the poly lower parts kit or did you use a standard lpk in your lower?


    I'm curious because I was at the range with Venix on Saturday and he brought his recently built AR15 with a NFA poly lower and a complete polymer lpk. This is how our experience with the NFA lower went...

    1st trigger pull... pop pop "did that just double fire?"

    2nd trigger pull... pop pop "yeah, it double fired" "do it again"

    3rd trigger pull... pop pop pop "wtf"

    4th trigger pull... pop pop pop pop pop "let's have a look at this"

    I pulled the lower apart and saw it had a polymer lpk and I had no clue they even made poly lpk's until I saw this one. After a closer look, it appears that the disconnector is rounded off where it should be a sharp edge, which looks like it's causing it to slip, and slam fire. CJ explained that slam firing can be common with shitty lpk's.


    So a standard disconnector looks like this



    The poly disconnector is rounded off and looks like this
    Last edited by motoman; 01-13-2014, 08:20 AM. Reason: Added a picture
    Originally posted by Jester
    Every time you see the fucking guy....show him your fucking dick.. Just whip out your hawg and wiggle it in his direction, put it away, call him a fuckin meatgazer, shoot him the bird and go inside.
    He will spend the rest of the day wondering if he is gay.
    Originally posted by Denny
    What the fuck ever, you fucking fragile faggot.
    FORGTN SOLD1ER - xbox gamer
    Tags: None
  • #2
    I built one but haven't shot it yet. It is a PSA LPK though.
    Fuck you. We're going to Costco.

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    • #3
      You shouldn't have any problems Keith, I've got the PSA lpk in my SBR and it runs like a champ.
      Originally posted by Jester
      Every time you see the fucking guy....show him your fucking dick.. Just whip out your hawg and wiggle it in his direction, put it away, call him a fuckin meatgazer, shoot him the bird and go inside.
      He will spend the rest of the day wondering if he is gay.
      Originally posted by Denny
      What the fuck ever, you fucking fragile faggot.
      FORGTN SOLD1ER - xbox gamer

      Comment

      • #4
        Chris built one into a machinegun and that thing runs great. The fit is odd though (mags need to be rammed in and then you need to wiggle the mag release).
        Originally posted by lincolnboy
        After watching Games of Thrones, makes me glad i was not born in those years.

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        • #5
          Poly internals in a DI gun? Not for me.
          ZOMBIE REAGAN FOR PRESIDENT 2016!!! heh

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          • #6
            As DOHCTR stated, I have one but the fit is awful to say the least. After reading so many good reviews I bought one and was not impressed to say the least. It has a PSA lpk and once everything has been slammed, pushed, and beaten in to its place, it runs like a champ. Mags are a pain to put in, the mag release has to be pushed both ways, because it always sticks, and when putting on a new lower, the pins have to be hammered in and out with a punch.

            I have owned a plum crazy and omni lower and been very happy with those.

            Comment

            • #7
              Originally posted by phaux View Post
              As DOHCTR stated, I have one but the fit is awful to say the least. After reading so many good reviews I bought one and was not impressed to say the least. It has a PSA lpk and once everything has been slammed, pushed, and beaten in to its place, it runs like a champ. Mags are a pain to put in, the mag release has to be pushed both ways, because it always sticks, and when putting on a new lower, the pins have to be hammered in and out with a punch.

              I have owned a plum crazy and omni lower and been very happy with those.
              My Mag Release needed to be file fit. Works like a champ now. My take down pins and trigger pins ALL needed to have a drill bit ran through them. They function like my aluminum lowers do now. Magpul Pmags drop free, only tested empty ones though.

              My only bitch is, the uppers fit TIGHT but that can be a good thing.....and the front take down pin does not extend out on the left side of the receiver.

              This NFA I have built, is going to be my .22lr pistol (maybe SBR) and I think it will be fine for that. I would like to build the other and see how it holds up to .223.
              Fuck you. We're going to Costco.

              Comment

              • #8
                I believe our specific question is about the internals and not the lower. The lower works fine, mags fit fine, all parts fit ok, but the design seems to have a flaw. I will likely need to send it back to the manufacturer because I am not going to go to jail for their screw up. I could replace the internals, but then it is just a waste of money on the parts that came with it, so I would rather just give it back.

                Comment

                • #9
                  Are you sure the trigger pin didn't walk out? That will cause exactly what happened, the disconnected drops too low. The reason the polymer one is rounded is because a sharp point would wear down both the disconnector and the hammer shelf.
                  "When the people find that they can vote themselves money, that will herald the end of the republic." -Benjamin Franklin
                  "A democracy will continue to exist up until the time that voters discover that they can vote themselves generous gifts from the public treasury." -Alexander Fraser Tytler

                  Comment

                  • #10
                    Originally posted by CJ View Post
                    Are you sure the trigger pin didn't walk out? That will cause exactly what happened, the disconnected drops too low. The reason the polymer one is rounded is because a sharp point would wear down both the disconnector and the hammer shelf.
                    Guess I'm not sure what you mean by walk out. We had to tap the trigger pin out with a punch if that's what you mean. There was no movement in that pin without a punch.
                    Originally posted by Jester
                    Every time you see the fucking guy....show him your fucking dick.. Just whip out your hawg and wiggle it in his direction, put it away, call him a fuckin meatgazer, shoot him the bird and go inside.
                    He will spend the rest of the day wondering if he is gay.
                    Originally posted by Denny
                    What the fuck ever, you fucking fragile faggot.
                    FORGTN SOLD1ER - xbox gamer

                    Comment

                    • #11
                      I spent a good deal of time with mine, file fitting the mag well and other areas so that it functioned like I wanted. Still could use a bit of work in the rear take down pin area, it is pretty snug. I have zero issues with Pmags and my mag release. I may have it for sale once I pick up my lower receivers from the GB. It will be an assembled lower with a P-tac LPK (metal internals) if anyone is interested.
                      Originally posted by Leah
                      Best balls I've had in my mouth in a while.

                      Comment

                      • #12
                        I built a NFA lower with a LPK from Darren, it has issues accepting gen 3 windowed p mags for some reason, it was also really really tight with my upper, to the point where you couldn't pull the charging handle. I filed it down a little with some sand paper and now it works fine.
                        Street car.

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                        • #13
                          summary: nfa lowers suck.
                          "When the people find that they can vote themselves money, that will herald the end of the republic." -Benjamin Franklin
                          "A democracy will continue to exist up until the time that voters discover that they can vote themselves generous gifts from the public treasury." -Alexander Fraser Tytler

                          Comment

                          • #14
                            Originally posted by CJ View Post
                            summary: nfa lowers suck.
                            Eh, a little bit of fitting required which is to be expected with injection molding. Other than that, zero issues after 200-300 rounds
                            Originally posted by Leah
                            Best balls I've had in my mouth in a while.

                            Comment

                            • #15
                              Originally posted by CJ View Post
                              summary: nfa lowers suck.
                              Other than the internals, my lower has no issues. The mags do not stick, the release works perfect, and the fit is quite nice.

                              The internals on the other hand, seem to suck.

                              Comment

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