Barrel throat

[wayne74]

I have a LCS SK-19 air rifle that shoots very good as long as the barrel is clean ,but it does not stay clean very long. While I had the barrel off for cleaning I checked the bore with a bore scope and the throat is very rough, with ridges from the throating reamer. Can anyone tell me what angle the throat is cut so I can make a lapping tool to clean it up.

Thank you.

Wayne

 

[biohazardman]

You should not have to do that on a 2K gun! I had barrel problems too. It took several months to get it figured out. But only ten days once I broke down and sent the whole thing back to AOA. They did a great job!

https://www.airgunnation.com/topic/lcs-sk-19-barrel/

https://www.airgunnation.com/topic/if-it-wasnt-for-bad-luck/

https://www.airgunnation.com/topic/more-barrel-problems-with-sk-19-grrr/

 

[Michigander]

If you are going to make a lapping tool, you must have a lathe. In that case, with the barrel chucked up try tracing the angle with a fine tipped test indicator mounted on the compound. That will be the machining angle for the lap. If that doesn't work, it's Dykem and trial and error. You will probably want to confirm the angle with layout fluid in any case.