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View Full Version : Embarassing AR15 question - did I just destroy my lower?


buymenow00
03-21-2012, 9:31 PM
OK, this is a pretty embarassing question to ask, and this was totally my fault :facepalm:: I have a Stag upper with a Bushie lower and the fit of the pins is extremely PITA tight. In my frustration, I had no choice but to resort to a pin pusher and a hammer on the rear pin :eek: - of course I overdid it and the pin took the detent with it through the lower receiver!! So now I have an enlarged hole with the detent spring sticking out of it.

I'm sure the gun will still run, but how does something like this get fixed? Weld or solder metal in there and grind it down with a refinish? Any suggestions?

cltitus
03-21-2012, 9:37 PM
Post a picture of the damage please

freonr22
03-21-2012, 9:38 PM
Drill larger and steel sleeve with an interference fit tolerance, redrill the detent hole through the sleeve. An you post a pic? And I have heard of this a couple times on here.

It's not the end of the world. Thank you for being part of spreading the black rifle disease.
It won't be your last lower.

It's ok. The sleeve method I am referring to I have not personally done, it's probably not terribly hard to do if you have the metal skills.
Or you could try to jb weld it and redrill. Use some birch Casey alums black. The best that happens is it's kinda easy, and not time intensive, the worst that happens is it doesn't work and you have to do #1 anyways. IMHO

buymenow00
03-21-2012, 10:20 PM
Hey guys, thanks for the quick replies...I got everything back together, and it is just as difficult to put the pin in as it is to get out, so unfortunately I'm done for tonight and will have to take pics another time. My new detent is the detent spring itself!

SWMP15
03-21-2012, 10:49 PM
I had two Bushmaster uppers for my LMT lowers, and both pins were extremely tight to get in and out. I had to tap them in easily with the back end of a screwdriver, and then use a hard plastic punch to easily tap the pins back out.

EKIM
03-21-2012, 11:15 PM
I've never used one, but there's also this
http://www.knsprecisioninc.com/push-button-take-down-pin-250-dia.html

stix213
03-21-2012, 11:19 PM
Worst case scenario you can ditch the spring & detent and go with these pins instead:

http://www.brownells.com/.aspx/pid=17158/sku=923-000-044/Product/-250-P-B-Takedown-Pin

I'm running one to correct a mistake I made on my first 80% lower build. Works good enough

stix213
03-21-2012, 11:20 PM
I've never used one, but there's also this
http://www.knsprecisioninc.com/push-button-take-down-pin-250-dia.html

lol just beat me :p

Purple K
03-21-2012, 11:43 PM
Check for interference from the buffer tube, sometimes the top portion of the buffer tube will extend too far forward. The upper receiver will contact the buffer tube before seating fully against the lower. I was just about to whip out a round file to enlarge the hole on the upper for the rear pin, when I noticed the cause.

.45JHP
03-22-2012, 10:14 AM
Check for interference from the buffer tube, sometimes the top portion of the buffer tube will extend too far forward. The upper receiver will contact the buffer tube before seating fully against the lower. I was just about to whip out a round file to enlarge the hole on the upper for the rear pin, when I noticed the cause.

This.

Make sure your buffer is also all the way seated back, as stupid as that sounds.

Sicarius
03-22-2012, 10:19 AM
Did the pin push through the receiver? Another thing you can do is get a long pin and a shorten the spring. The pin is pretty short and the channel is fairly long. You may be able to cut the spring short and use a long pin(make one) so the rest of the channel supports it.
Kevin

luchador768
03-22-2012, 10:42 AM
It's not a RAW bushmaster is it? If it's not just replace it. Eventually it will effect the operation of the rifle, and it won't happen at a convenient time.

Moonshine
03-22-2012, 11:41 AM
DePending on the lower you may just want to pull the LPK out of the damaged one and rebuild into another stripped lower... If its a nice one though you may want to repair... Hard to to without pic tho

buymenow00
03-22-2012, 12:11 PM
Actually it is a RAW Bushie lower...so yeah, I'll feel really dumb if I can't fix it somehow since it is essentially irreplaceable (at least in Kali).

I'm going to pick up the KNS push pins suggested by stix213 and EKIM...I think that could solve the problem for less than $20. I also like Sicarius' idea about creating an extended detent and then shortening the spring...sounds like it could work but will involve some metal crafting. We're only talking about maybe 2mm of metal that is missing from the side of the receiver around the pin hole so I'm sure there is a way to patch her up!

triggs75
03-22-2012, 12:22 PM
I would say to go for this:

http://www.demontactical.com/demon-tactical-quick-p-57648.html

http://www.ar15.com/archive/topic.html?b=7&f=125&t=789754

http://www.demontactical.com/images/quick_pin001_1_1%20(1).jpg

http://jabtac.com/store/images/large/DTQP/DTQP_02_LRG.jpg

killshot44
03-22-2012, 1:11 PM
http://jabtac.com/store/images/large/DTML/DTML_03_LRG.jpg
I think their model that uses a 5.56 case for a lever is clever......but the lever is more user-friendly.

Only problem is losing the damned things. Stoner put those pin detents in there for a good reason.
Imagine looking for this part in the weeds....

thedrickel
03-22-2012, 1:35 PM
I milled an 80%er too much in that area and the detent broke through. The pin is still a tight fit and I've shot thousands of rounds with it like that (no spring or detent holding the pin).

theneko
03-22-2012, 1:46 PM
I like the DT pin. I cant recommend the KNS push-pins. For me they were a pain to operate- had to push and pull at the same time. I didnt like it but YMMV.