AR Sponsor
Posted: 9/22/2009 10:09:50 AM EDT
|
My buffer pin is bent or perhaps the hole has been galled or opened somehow. Anyway, the pin looked like it is being pushed forward by the buffer itself. The buffer is a replacement (Tubb if I remember correctly).
I removed the pin and the rifle functions fine and as long as I remember to hold the buffer back when I break the rifle down to clean, all is well. I replaced the original receiver with the Alexander Arms billet receiver and that's when I found this. It may have been there before, but I don't know for sure. The internals of the old receiver; bolt, carrier, etc. went into the Alex Arms receiver. The rifle is a Colt Match, Target, Competition, something. I don't know the model #, etc. It's got a heavy Kreiger SS barrel by CLE who customized the rifle. I would like to find out what caused the pin problem and what, if anything, I can do to rectify it or even if I should. Thanks for any and all help. Roy Edited to state that the problem was later, after the Alexander Arms receiver was installed. |
|
In a "perfect world" the buffer retainer pin should only be applying pressure to the bottom of the receiver extension on an assembled rifle with upper installed. If the receiver extension is to far forward installed (buffer retaining hole/channel milled too far rearward in the lower receiver), the bolt is not taking the slack off the the buffer head and the buffer head is slamming against the buffer retaining pin on every cycle. Also, the retainer hole can be slightly off causing the same effect.
Any chatter marks on the buffer head? Also, pics would help. |
|
Quoted:
As stated, a photo of the face of the buffer will tell the tale, such as in this nightmare. 
http://i81.photobucket.com/albums/j226/Dano523/bufferfacemarkedup.gif?t=1253659668 what on God's green earth happened to the face of that buffer???? I see all the marks from the retaining pin, but what is the rest of the damage?? |
|
#1 was the channel drilled too far out of spec, with the buffer never being cam'd back by the carrier as the action was closed.
# 2 was burs on the back side ring of the carrier (both outer and inner). # 3 was burs on the back C cut channel that was cutting into the face of the carrier every time the upper was opened and closed back down. And to really compound the problem, the buffer was not anodized correctly, leaving the face of the buffer soft as butter. |
|
Quoted:
My buffer pin is bent or perhaps the hole has been galled or opened somehow. Anyway, the pin looked like it is being pushed forward by the buffer itself. Might be completely normal too. The hole for the buffer retaining pin should be canted forward 6 degrees from the factory. 
|
AR Sponsor