5.45x39 troubleshoot
Hey guys, I have one of your 5.45x39 uppers, AA receiver, barrel, bolt, hammer spring etc.. I am having an extremely difficult time getting it to extract, I've heard that this is caused primarily by the laquer on the 5.45 cases building up in the chamber? I've scrubbed and scrubbed and its still a one shot, slam the buttstock while pulling down on the charging handle kind of issue. Do you have any suggestions? I bought a serious quantity of surplus ammo to run in this bad boy and I don't want to get rid of it. Appreciate any advice you or the members here have-
Would laquer thinner work?
well if you intend to clean the chamber with it, I would assume the plethora of chemicals I am using now get the job done, and if you mean cleaning the individual rounds Im not up to that task!
How many rounds do you have thru the upper?
Mine had the same problem until about 600-800 rounds. then things seems to loosen up.
My only problem now is getting the bolt to hold open after the last round.
I had the same problem with my AR in 556, it would extract the round but the bolt wouldn't close on the next round, it turned out to be the mags I had.
I dont know if this helps, I'm thinking about the upper you have, it sounds like the perfect upper for the surplus 545x39.
Actually several things can cause this specific issue. Why don't you give us call directly. We can talk in detail over the phone and do some trouble shooting to see if we can determine what is going on. Call 727-853-0550 between 9 am and 6 pm EST and someone here will be able to help you out.
Thanks guys, will give you a call tomorrow when I get back from my trip.
If you are using Warsaw Pact surplus 5.45x39mm with laquer coated cases, the laquer does not melt at firearms temperaures.
You can't "melt it" with a blowtorch. Old_Painless (and others) has tried and its on the Box o'Truth website.
If the laquer melted at firearms temperatures, the AK would have a reputation as a jam-o-matic.
Case geometry, coupled with metalurgy on top of powder used and case sealant accounts for most issues.
The mild steel does not expand like brass (it expands well enough for use in cartridges, but not exactly like brass).
The case is tapered from the base of the shoulder to the extraction groove, whereas the 5.56x45mm is straight walled from the base of the shoulder to the extraction groove.
Warsaw Pact surplus uses various case sealants that are left in the chamber after firing.
Good info to know, Thanks for the post, AA guys, sorry I didn't call, I had to deploy. Unfortunately I don't think I will be investing any more time into the upper, I will pass it on if anyone here is looking for 5.45x39 components when I get home in Oct? let me know..... thanks everyone.
Originally Posted By ODA_564:
If you are using Warsaw Pact surplus 5.45x39mm with laquer coated cases, the laquer does not melt at firearms temperaures.
You can't "melt it" with a blowtorch. Old_Painless (and others) has tried and its on the Box o'Truth website.
If the laquer melted at firearms temperatures, the AK would have a reputation as a jam-o-matic.
Case geometry, coupled with metalurgy on top of powder used and case sealant accounts for most issues.
The mild steel does not expand like brass (it expands well enough for use in cartridges, but not exactly like brass).
The case is tapered from the base of the shoulder to the extraction groove, whereas the 5.56x45mm is straight walled from the base of the shoulder to the extraction groove.
Warsaw Pact surplus uses various case sealants that are left in the chamber after firing.
THIS x1,000
The Internet seems to have perpetuated the "laquer melting" myth far beyond its deserved lifespan
