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Nathan.g · April 19th, 2017, 10:40

Hey everyone,

I will be a thorough as possible because I am truly out of ideas.

A friend of mine had his KWA m4 take a tumble and resulted in A LOT of broken parts. As a result, we did a full rebuild. The problem is fairly simple; the gun is shooting at a constant 125-127 fps w/m110 spring.

When gun is fully assembled it shoots 125-127 fps; without the upper and when I just hold the hop up unit in place, fps jumps to the 270 fps range.

The gearbox has been ruled out; full cylinder, perfect seal, and shimmed w/ brand new high torque motor. I have changed out parts and started from scratch but no change in performance.

I am wondering if this might be a result of the 2 piece hop up pushing too hard on the gearbox, but after shunning the outer barrel out about 1cm, same issue persists. The inner barrrl is a brand new 455 madbull 6.03 and I installed a brand new 70d lonex bucking (no air leaks and squeeky clean)). Bbs do not roll out of barrel but can be pushed through with ease.

Could the bbs be getting caught on something? Has anyone experienced this before? Could this just be an ever so slight nozzle misalignment?

Thanks in advance for any help you can provide!

April 19th, 2017, 10:40	#1
Nathan.g Trader rating Join Date: Jan 2016 Location: Beeton, Ontario	M4 shooting VERY low fps after rebuild Hey everyone, I will be a thorough as possible because I am truly out of ideas. A friend of mine had his KWA m4 take a tumble and resulted in A LOT of broken parts. As a result, we did a full rebuild. The problem is fairly simple; the gun is shooting at a constant 125-127 fps w/m110 spring. When gun is fully assembled it shoots 125-127 fps; without the upper and when I just hold the hop up unit in place, fps jumps to the 270 fps range. The gearbox has been ruled out; full cylinder, perfect seal, and shimmed w/ brand new high torque motor. I have changed out parts and started from scratch but no change in performance. I am wondering if this might be a result of the 2 piece hop up pushing too hard on the gearbox, but after shunning the outer barrel out about 1cm, same issue persists. The inner barrrl is a brand new 455 madbull 6.03 and I installed a brand new 70d lonex bucking (no air leaks and squeeky clean)). Bbs do not roll out of barrel but can be pushed through with ease. Could the bbs be getting caught on something? Has anyone experienced this before? Could this just be an ever so slight nozzle misalignment? Thanks in advance for any help you can provide!