New M14 owner, some question about the bolt.

WhoKilledBambi

WhoKilledBambi

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Hello everyone!

I recently(today) aquired a Polytech M305.

My question is it appears to me the right bolt lug doesnt even touch the receiver when closed. Is this quick fix? The left lug seems to hold the bolt closed but the right one does not even touch the receiver, or maybe i am wrong. Not too familiar with this rifle yet.

Any advices appreciated,
JP
 
I would shine a very bright light directly down at the bolt lug area and look from the side to see if I could see light there to indicate that there is indeed a gap. Also would be using a black marker on the bolt lugs and the reciever lugs then working the bolt back and forth with some pressure to the rear on the bolt to see if there is any contact. The best way would be to disassemble the bolt and check the contact using the method shown by Tony Ben in his video about lapping the bolt lugs.

Rodney
 
It is also possible the op rod is not fully engaged in the receiver. I encountered this with a newb's M305 when he asked me for help.

There are plenty of videos on YouTube on disassembly/assembly which would be a good start & go through the stickies in the battle rifle forums.

Either way, you'll get plenty of assistance here.

Welcome to the addiction!
 
It's really quite simple.

Degrease the receiver and bolt
Felt pen or machinists blue the rear bolt lug faces and then cam the bolt up and down with rearward pressure.
Do that 15 or 20 times and pull the bolt.
The wear marks in the felt penned areas should give you an idea on lug contact and how even it is or isn't
 
45ACPKING said:
It's really quite simple.

Degrease the receiver and bolt
Felt pen or machinists blue the rear bolt lug faces and then cam the bolt up and down with rearward pressure.
Do that 15 or 20 times and pull the bolt.
The wear marks in the felt penned areas should give you an idea on lug contact and how even it is or isn't
Click to expand...

+1:d
Rodney
 
Out of curiosity, shouldn't he lapping be done directly on the bolt instead of both the bolt and the receiver (assuming a correctly shaped receiver)?

This would ensure any amount of lapped bolts to be swappable without having to re-lap every time.
The receiver would also be preserved to its original shape.
 
eXodus31337 said:
Out of curiosity, shouldn't he lapping be done directly on the bolt instead of both the bolt and the receiver (assuming a correctly shaped receiver)?

This would ensure any amount of lapped bolts to be swappable without having to re-lap every time.
The receiver would also be preserved to its original shape.
Click to expand...

I think ideally yes but in practice this would be really difficult given the tolerances for good lug contact. Also "a correctly shaped receiver" lug may be a reasonable (but not always correct) assumption in a USGI receiver but we're talking Norc receivers at 20% of the cost.
 
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