Type 81 bouncy vibrations after each shot?

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walter23

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Got the chance to shoot a Type 81 today and one thing that I noticed was it seemed to have a lot of wobble after every shot, as if some heavy springy mass were settling into position. More so than an SKS or VZ58 or other similar piston operated gun, this wasn't the usual piston gun KERCHUNK, but kind of a weeble-wobble-weeble-wobble that took like half a second to settle down.

I wondered if maybe the cleaning kit & spring in the stock was to blame, but taking out the cleaning kit didn't make much difference.

Is this typical? Could it be an unusually weak recoil spring or gas piston spring?
 
It's more of a problem with how you perceive the recoil.
The bolt doesn't hit the rear trunnion very hard (or at all with some ammo), so you're getting a very long, soft recoil effect with both hits being the bolt leaving and going back into battery. Know someone who can't stand the effect, but I quite like it. It's just different.
It's got nothing to do with how light and wobbly the receiver is (it is neither). I don't know how someone could come up to that conclusion.

EDIT: And to avoid bumping for no good reason, I'll just add it here. The recoil impulse curve also has nothing to do with the general quality control and assurance from the manufacturing process. People who don't know or understand what is even being discussed should refrain.
 
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walter23 said:
Is this typical?
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No, mine was fine. You have "won" a Chinese lottery.

I talked to a guy on the range who served in PLA and he told me quality was hit and miss with these even in the 90s. He also told me that my groups opening up with shooting is poor heat treatment of the barrel.
 
Never noticed a vibration per say, but definitely agree with the " Kerchunck " description haha. A long but soft impulse... I like it. VZs and SKS rifles are straight up snappy in comparison. The AK i shot in Poland felt similar in recoil impulse to the Type 81sa.
 
I have read that the Type 81 was designed to be more controllable at full auto then AK. This may be the cause of its unique recoil impulse.
 
walter23 said:
Got the chance to shoot a Type 81 today and one thing that I noticed was it seemed to have a lot of wobble after every shot, as if some heavy springy mass were settling into position. More so than an SKS or VZ58 or other similar piston operated gun, this wasn't the usual piston gun KERCHUNK, but kind of a weeble-wobble-weeble-wobble that took like half a second to settle down.

I wondered if maybe the cleaning kit & spring in the stock was to blame, but taking out the cleaning kit didn't make much difference.

Is this typical? Could it be an unusually weak recoil spring or gas piston spring?
Click to expand...

That’s exactly how I perceived the recoil from the first AR I ever shot.
 
I recall watching a very slow motion film on an AK firing, the thing bends and twists, and the barrel waves like a rope. All in all it looked like an assortment of parts trying to stay together long enough for a bullet to get out of the barrel.
But that is how it was designed and built, and it is the way it is I suspect; and it has proven to quite the rifle over the years.
 
What you see in slow motion is not something you can feel as anything other than instantaneous.
Again, what Walter is feeling is the recoil impulse curve of the Type 81.
 
Ustauk said:
I have read that the Type 81 was designed to be more controllable at full auto then AK. This may be the cause of its unique recoil impulse.
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Yeah, any feelings or observations of general crappiness are probably just due to its extreme deadliness.
 
I know, original AR18 has that authentic "you are not going to live more than 14 days in the war" vibe.

But is there any modern 180 which doesn't feel like it was assembled in uncle Liao's bicycle shop?
 
Trapanese said:
Build quality and reliability of all my T81s are better than my many WK180s made in Canada. What do you shoot that isn't lackluster?
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300%!!!

Sold the WK180 and bought the T81. It's cheaper and comes out of the box ready to rock and lock. No need to purchase sights, or drill out the receiver and replace the nylon piston guide bushing, extractor, and add a shell deflector.... blah blah blah... By the time I had my WK180 working as it should, I was nearly $1800 deep, had a box of spare parts like pistons and extractor springs, and still had a 4-inch long hole in the side of my rifle and a charging handle that is thread locked in making field stripping at the range a pain..

buy a MCR they said.... #### that.... hard to beat a military-tested and proven rifle with over 30 years behind it. Not to mention having a reputation for being "more" reliable than the often considered most reliable gun, the AK...

that's my $0.02... The T81 is the best deal going for a solid reliable rifle that is ready to roll outta the box.
 
BlackVoid said:
No, mine was fine. You have "won" a Chinese lottery.

I talked to a guy on the range who served in PLA and he told me quality was hit and miss with these even in the 90s. He also told me that my groups opening up with shooting is poor heat treatment of the barrel.
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Rifle barrels are not heat treated.

A ton of internal stresses are imparted into the steel during the process of turning a steel rod into a finished barrel. It is these stresses that cause barrels to warp when they get hot. This problem can be mitigated via cryogenic treatment.
 
farshot said:
I recall watching a very slow motion film on an AK firing, the thing bends and twists, and the barrel waves like a rope. All in all it looked like an assortment of parts trying to stay together long enough for a bullet to get out of the barrel.
But that is how it was designed and built, and it is the way it is I suspect; and it has proven to quite the rifle over the years.
Click to expand...

This is not unique to the AK. Most rifles do exactly the same. Even the heaviest target barrel whips around as the bullet travels down the bore. This is why there are velocity related accuracy nodes. A rifle barrel is akin to a tuning fork and has a resonant frequency.
 
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