- Location
- pallisers triangle
not sure if this belongs hear or not, but hear we go. anyone else with one of these lil AIA rifles in 7.62x39 haveing extraction probs? mine keeps leaveing a fired round in the chamber and will not extract it
Aia m10a
- Thread starter Beater
- Start date
It's probably that lacquer on the surplus cases building up in the chamber. If you have any ammo with brass cases, does it happen with them too?
- Location
- pallisers triangle
im useing the standard steel lacquerd stuff. it was clean and new, and it was the 6th and 8th round, after that i took it home. nothing under the extractor, and the chamber is / looks good. ive given it a good polish, and gona try it again
Not the same rifle but I have an extraction problem with my 7.62x39 Ruger M77mkII when shooting the steel cased lacquered ammo but it usually doesn't happen until I've got at least 200rds through it since the last cleaning. The extractions start getting sticky and eventually the extractor will pull over the rim and leave a fired round in the chamber. A good cleaning of the chamber will then pull all back to rights and it will function fine for another 200+ rds.
I dont have mine anymore but I remember a note about lacquered ammo in the manual. The hotter the chamber gets, the more lacquer will be left in the chamber. It almost turns into contact cement. SKS's seem to run the best on surplus x39 so I think cantom is right about the loose chamber, CZ 858's are more problematic if not cleaned regularily with their tighter chambers as well.
I believe that on semi guns the round starts extracting instantly while the case is still maximally hot and malleable. On a bolt gun, the second between firing and extraction allows it to cool and seize up at times. Steel cases are best in semis and brass is the way to go for a bolt gun as the casing rebounds elastically much better.
Interesting. So that hot case melts the lacquer and cements the shell into the chamber, as it's sitting there till you work the bolt.
I guess the bottom line is, no lacquered ammo for bolt actions, or expect extraction problems.
I guess the bottom line is, no lacquered ammo for bolt actions, or expect extraction problems.
So I am home in 2 weeks to try my hand at my M10 again, I agree what is hte point if we cant shoot the cheap stuff,,,, Is the answer super cleaning the chamber? the barrels on these are chromed, what about the chamber? Does that make a difference? Has anyone had any resolution yet?
Not really - I think the lacquer might contribute, but with steel cases you can see this even with unlacquered cases.
There is a short dwell time in a semi to allow the pressure to drop so the case will extract, otherwise the case expands into the chamber so tightly that the extractor tears the head off the case. Semi's usually run a looser chamber to facilitate easier feeding/extracting. Its once the chamber gets hot that it really starts working on the lacquer. Just buy an x39 chamber brush, or grab one from a VZ58 cleaning kit and bring some lacquer thinner with you to the range. Once it starts getting sticky, give it a quick clean. I geuss its the price of playing with the cheap stuff. I imagine the tighter chamber was an accuracy thing, who wants to buy an $800 rifle that shoots as poorly as a $200 rifle? The US and Australia mostly have commercial brass cased ammo so it makes sense to me. Let us know how it goes Beater
- Location
- pallisers triangle
well after a super polishing job, i went to the range thisaft. fired 30 rounds as fast as i could and got it warmed up.
next round i shot and waited for 10 seconds to remove , and i came out fine. i fired a total of 160 rounds thisaft without a prob. guess it just needed a lil TLC. sure shoots well, im a fan again
next round i shot and waited for 10 seconds to remove , and i came out fine. i fired a total of 160 rounds thisaft without a prob. guess it just needed a lil TLC. sure shoots well, im a fan again
Do you think the chamber had a little mung in it, or roughness, or lacquer?
