essjay
12-20-2016, 8:46 PM
Built-up a Gen 2 Aero Precision lower recently to supplant my Gen 1 AP lower. Put the old upper (Aero Precision M4E1 with a Seekins rail) on the new one to check the fit, and noticed that the rear takedown was extremely tight to remove, but otherwise seemed fine.
So, my new upper shows up today, normal Aero upper with an ALG V2 rail on it. I try to put it on the new lower and... the front takedown won't go in. I then put the new upper on the old lower and and it fits perfectly fine. So, then I attach the old upper to the new lower and find that it fits, but like before, the rear takedown is super tight.
So I try the new upper again, and while I can get the rear takedown in and out fine, the front just won't slide in. So I try the rear hole of the upper in the front takedown slot, and it slides in fine. Then I try the front hole of the upper in the front takedown slot, with the upper vertical and reversed, and it slides in fine.
Trying again, I fail to get the front takedown to go in, so I slide in the rear takedown to lock it in place, look at it real close, and notice that the ALG handguard is in contact with the front right takedown ear of the new lower. I put on the old upper and find the same situation is true, but I can still attach the upper because the rail is just slightly further away from the upper at that point.
Looking at the new lower, it seems to me that the right ear is just slightly larger than that of the left (or the old lower). So, given that I can't just call up Aero and ask them to replace the slightly out-of-spec lower with a good one due to the fact that it's December 20, 2016, should I just file the ear down and hope for the best?
edit: I have a terrible camera, so I've drawn it out a bit here using some stock photos.
http://i.imgur.com/ww1ioLh.jpg
So, my new upper shows up today, normal Aero upper with an ALG V2 rail on it. I try to put it on the new lower and... the front takedown won't go in. I then put the new upper on the old lower and and it fits perfectly fine. So, then I attach the old upper to the new lower and find that it fits, but like before, the rear takedown is super tight.
So I try the new upper again, and while I can get the rear takedown in and out fine, the front just won't slide in. So I try the rear hole of the upper in the front takedown slot, and it slides in fine. Then I try the front hole of the upper in the front takedown slot, with the upper vertical and reversed, and it slides in fine.
Trying again, I fail to get the front takedown to go in, so I slide in the rear takedown to lock it in place, look at it real close, and notice that the ALG handguard is in contact with the front right takedown ear of the new lower. I put on the old upper and find the same situation is true, but I can still attach the upper because the rail is just slightly further away from the upper at that point.
Looking at the new lower, it seems to me that the right ear is just slightly larger than that of the left (or the old lower). So, given that I can't just call up Aero and ask them to replace the slightly out-of-spec lower with a good one due to the fact that it's December 20, 2016, should I just file the ear down and hope for the best?
edit: I have a terrible camera, so I've drawn it out a bit here using some stock photos.
http://i.imgur.com/ww1ioLh.jpg