Need Opinions on Rear Trunion Contact in AK47's


August 15, 2007, 07:30 PM
Hello all. Just got an unfired Chinese Mak 90 ( AK clone ) in and I'd appeciate some info / opinions. I've heard this debate go both ways. Does the rear of the bolt carrier make contact with the rear of the receiver at the rear trunion while cycling during fire , or does the recoil spring stop this contact just short of it hitting anything? Also, while manually cycling the action, do you think I'm damaging the carrier, bolt or trunion when I pull the carrier back with reasonable force ( nothing abusive ) until it stops ? Just to test feeding, extraction and ejection with a few rounds, I applied manually what I thought to be about the same bolt speed as actual firing to feed and eject the rounds which flew probably 10-12 feet . During this the carrier was pulled back until it made contact. Since it's new and tight yet, this modest amount of force is needed to just get the action to not stay locked back . I know they are built like tanks, but at the same time I sure don't want to hurt or abuse anything. Will normal firing ( if I decide to shoot this 1 ) be as or more violent to parts as manual cycling occasionally would be ? Thanks

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August 15, 2007, 08:00 PM
Not normally unless its got a weak recoil spring NOW one thing to watch with the Chicoms is sometimes an SKS spring got installed instead of the stiffer AK spring............

in this thread are pics of a rear trunion in a totally worn out AK with the original spring, the details are already posted in the thread so I won't retype all the info etc... the short version as ya can see from the pics is the only damage was to scuff the finish on the rear trunion and the bolt carrier etc... and that was under full auto use to the extent the barrel is totally shot out......

oldtimers settin in....... forgot to add the link ;)

August 15, 2007, 08:19 PM
The Chinese MAK-90 rifles are made in the same factories,from the same parts(minus the full auto parts) used to make the rifles issued to the Chinese Peoples Liberation Army and the ones that are in use all over the world. There is no way that you can cycle the bolt by hand and hurt it in any way. You would be hard pressed to look at any of my Chinese AK rifles and tell which ones have a thousand or which ones have had 10,000+ rounds fired in them.

August 15, 2007, 08:22 PM
dstorm, thank you. I sent you a PM for you to respond to please.

August 15, 2007, 08:26 PM
JA, many thanks to you as well on answering part 2 . I'll be gone a few days , so I thank any other responders in advance for your thoughts, but they will all be read and appreciated.

August 15, 2007, 10:35 PM
A recoil buffer should end your fears. Goes in front of the end of the reciever and where the spring keeper goes in. It is supposed to reduce felt recoil and prevent the condition of which you describe. I have buffers in most of my AK's and even a ROMAK III. There isn't room for one in my Saigas, and there is a part which might actually be a buffer. Whether or not they work, they seem to especially in an AK pistol, they only cost about $10 and last quite awhile.

August 15, 2007, 10:55 PM
assuming i do this right, below is a link to a thread i started on the SKS forum dealing with this same issue. you should find it useful and informtive,as i did....

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