bushmaster ar15 part question...

[007derek]

I just got my new Bushmaster ar15 , thus first thing i did was strip and clean
it. I'm new to Ar-15's and teaching myself as i go mostly from internet video';s.
Everything went well I changed the stock from a fixed to a 6 position , and
basic field strip, bolt , bolt carrier etc... everything went well and back together nice.
Today! 1 day after all this, about to head to the range i found a small pin looking part on the desk where I striped the rifle....
That said i skipped my range trip and came here to ask if anyone can identify
this part .. pic below...

Thanks in Advance...
007derek

 

[(Ronin)]

http://www.midwaysverige.com/schematics/ar15.html

 

[Dsiwy]

Is it a split pin? if so the only split pins that size are from the trigger guard and forward asset. Its not from the butt assy or bolt.

 

[Undergiver]

the pic is not very clear. give us some measurements. Is it a roll pin, did you do a function test ?

 

[007derek]

the pin is 1 1/4 inch and narrows at one end...
if its for sure not from the buttstock or bolt assy it may be from something else , just wanted to make sure ,
function test 100% working (as i can tell) , bold rack , dry fire , mag in/out
i have no dummy rounds to cycle but if everything else works

thanks for the replies....
007derek

 

[Undergiver]

I think it maybe from a broken punch or something like that. I fix these for a living, I cannot think of anything that you descibed.