Question on Browning Buckmark, rear sight base washers

[DarrenL]

Help me browning buckmark owners, you're my only hope!
So my browning buckmark's rear sight base keeps working its way loose, but if I really tighten it, I cannot rack the slide. So I need new screws and washers for it. Last time I think I ordered the wrong parts, (hence the problem just described) so I want to get it right this time.

I am looking at the official browning buckmark parts diagram, and they have a star washer (#58) and screws (#57, #59) listed with reference numbers. Here is the diagram for reference.

http://www.brownells.com/schematics/Browning-/Buck-Mark-sid366.aspx

But the parts list from browning also has "sight base screw lock washer" with reference "NS". This part:
http://www.midwayusa.com/product/690334/browning-sight-base-screw-lock-washer-buck-mark-pistol

So my questions:
1) What is reference "NS",
2) and do I need the lock washer and the star washer?
3) If so, which goes on top?

Thanks.

 

[allen-1]

I've got two Buckmarks, and I've had the sight mount off of each, (to mount optics). The mount bolts to the slide^W barrel and frame with two screws and two star washers as shown in the Browning diagram used by Brownells. I don't know what "parts list from browning" you're looking at, but there's no "second" washer for each/either screw.

The only possibility that comes to mind is that perhaps there's a lock washer in the sight assembly itself. I just tried to take mine apart, and it appears to require that the rollpin be pushed out to disaasemble so I stopped. (I didn't have a lot of time to fool with this -- my manager thinks I'm writing code...)

 

[DarrenL]

Found the problem. Apparently, you need to clean more than the barrel. There is enough fouling on the slide rails to jam a Glock.