Breech screw??

[mcc1961]

Does anyone have trouble keeping the small breech screw tight?I think I have fixed the problem with blue loctite and I am going to let it dry for 24 hours.It is on my 1377 carbine and have a 3-9x40AO  scope on it.Do you think the scope is too heavy.

[1377x]

thats up to you if its too heavy or not
i see a lot of 1377's with them or the bug busters
the blue loctite will do the job

[quickster47 †]

Of all the breechs I've changed out, probably close to a hundred, I have never had a problem with a loose screw. More often it is too tight and I must take extra time to remove it after I have damaged it.

You should be good with the blue Lock Tight.

Carl

[1377x]

i havent had the breech screw work loose either.but the loc-tite will solve your issue

[eric]

had a centerpoint 4-16x40 AO on a few and never had a problem

[mustangmike]

i really hope you got it tight that screw strips out easly

trick

use a c clamp between the tube and the breech just in front of the loading port clamp it down and then thread and tighten the breech screw in place and then remove the clamp.. by clamping it you are pushing the 2 together tighten then by hand or the screw.. when the screw is tightend and the clamp removed the breech and tube try to push themselves apart which they can do.

to remove the breech clamp it down good again and then loosen the screw

[1377x]

me personally i would cut a slot into the screw not too deep though
then a flathead screw driver can be used instead

[crossliner]

Here is mine in stainless It is an allen button screw ( see side by side pics ) but I had the diameter of the head lathe-reduced so that it mimic's Crosman's. Also I had the tube's thread retapped as it and Crosman's do not share the same thread configuration. What I like about this screw is that the allen wrench for it is 2mm as opposed to the infernal 1.3mm 




In its semi tightened state

[crossliner]

Now I can tighten it real good w/ no fear of stripping  Best regards.

[arkmaker †]

Are you using a 4-40 thread? I have thought about doing that in the past, but because the tube wall is so thin, I worried that there would not be enough threads and I would end up stripping them out. Let us know how longevity works out for you in say about 500 rounds, ok?
Rich

[crossliner]

Are you using a 4-40 thread? I have thought about doing that in the past, but because the tube wall is so thin, I worried that there would not be enough threads and I would end up stripping them out. Let us know how longevity works out for you in say about 500 rounds, ok?
Rich

Noted Mr. Ark and no I don't think (forgive my ignorance) it is a 4-40 it having fine threads. The tube wall may be thin but it is hardened steel is it not? Moreover ss is not too hard a material so it should more or less conform. Also I have observed that while turning the screw there is no looseness in fact it is on the tight side w/c I think is a good sign. I can really tighten it well it actually sounds like torque-wrenched. Best regards.