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Discussion Starter · #1 · (Edited)
Hello everyone, i have cyma 701 sniper rifle, vsr 10 copy, stock for now, it shoots about 490fps 0.2, i started to upgrade it slow, first on the list is 6.03 430mm steel barel, i notice after instal that my bb curve to the left after 20m,bucking is stock, but can this be a problem? New barel have smaller opening where it bucking goes, can i widen this hole like on stock?
 

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You can widen it, but you probably don't need to.

The stock vsr chamber puts pressure on the bucking unevenly and can cause curving issues at distance due to the way the arm is designed. There's also the possibility everything wasn't put back together perfectly straight, which can easily happen. Either way, I would recommend an AA chamber and then you would likely want to change the bucking to something Maple Leaf brand. If you do that, the bucking will also require you file the bridge off of the barrel you have.
 

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Discussion Starter · #3 ·
You can widen it, but you probably don't need to.

The stock vsr chamber puts pressure on the bucking unevenly and can cause curving issues at distance due to the way the arm is designed. There's also the possibility everything wasn't put back together perfectly straight, which can easily happen. Either way, I would recommend an AA chamber and then you would likely want to change the bucking to something Maple Leaf brand. If you do that, the bucking will also require you file the bridge off of the barrel you have.
But with stock barrel, a can hit 16cm hole from 45m 10/10 shots will hit, it not been curving, at least not after 55-60m
 

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Your new barrel seems to be like an aluminium one, is that a Lonex one? i think it can be probably a little bit bent and you cant even notice it, i suggest to keep using your stock setup if it works for you or you can buy a good quality stainless steel barrel, not a aluminium one.
 

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The easiest and cheapest way to eliminate potential issues would be to replace the hopup arm with a panthera arm+nub. The BEST way would be to replace the hopup unit with an Action army chamber, or a maple leaf chamber if you are into that sorta thing.
 

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Discussion Starter · #7 · (Edited)
Your new barrel seems to be like an aluminium one, is that a Lonex one? i think it can be probably a little bit bent and you cant even notice it, i suggest to keep using your stock setup if it works for you or you can buy a good quality stainless steel barrel, not a aluminium one.
No, it is stainless steel one and its brand new, and yep i had right about square hole, it is to small, i widen the hole like on the stock barel and sand it with 800 grid watter sandpaper to smooth edges, works like dream, and shoot straight as arrow, my frends, check first this part of the barel if you have any curving problem, if hole is to small, notch inside the, no matter what bucking, can't go deep as it should, and there is no even presure on bb and it will curve, here some pic before and after
 

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Cool, I’m always a fan of elbow grease way before going berserk on shopping for all possible upgrades. This my friends is how you save money on unnecessary upgrades which in fact all are poorly manufactured in China anyway.
 

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Discussion Starter · #9 ·
Cool, I'm always a fan of elbow grease way before going berserk on shopping for all possible upgrades. This my friends is how you save money on unnecessary upgrades which in fact all are poorly manufactured in China anyway.
Exactly, wish i had lathe,could made cylinder, pistons and heads easy, no need to buy expensive staff make you own
 
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