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Probably need to know a bit more! Front or rear wired? Tamia or Deans? Do they have a MOSFET fitted? Size of battery compartment, etc...

 
The M249 box mag is too slow to feed anything on more then a 7.4v lipo on my upgraded one. 

 
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Asomodai said:
The M249 box mag is too slow to feed anything on more then a 7.4v lipo. 
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Thought I’d test this, having picked up an A&K MK46 over lockdown. 500rds later, I’d better get the hoover out in the workshop!

My box mag keeps up with a 2600Mah 25c 11.1v Lipo in the context of a high torque build, (M100, Shs High Torque, 18:1) and has a reliable 23-24RPS output although I’m not sure you’d want an LMG delivering a higher ROF?! It'd start to get expensive if you were laying down a bag of 0.28's per minute!

Ignoring the battery, The hop chamber  in the MK46 is a bit shit and the new V2 Airsoft Pro unit is a worthwhile replacement for consistency. With a bit of feedlip shaving you can get a Maple Leaf 50 and nub in there and have an LMG that offers the same range as all the other AEGs on the field (as opposed to sometimes!)

 
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Alimcd said:
Thought I’d test this, having picked up an A&K MK46 over lockdown. 500rds later, I’d better get the hoover out in the workshop!

My box mag keeps up with a 2600Mah 25c 11.1v Lipo in the context of a high torque build, (M100, Shs High Torque, 18:1) and has a reliable 23-24RPS output. I’m not sure you’d want an LMG delivering a higher ROF?! 

Ignoring the battery, The hop chamber  in the MK46 is a bit shit and the new V2 Airsoft Pro unit is a worthwhile replacement for consistency. With a bit of feedlip shaving you can get a Maple Leaf 50 and nub in there and have an LMG that offers the same range as all the other AEGs on the field (as opposed to sometimes!)
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Mine is a balanced build with a ZCI 16TPA Neo motor and 18:1 gears. On a fully charged 7.4v its fine. As soon as I go to a 9.9v life or 11.1v it starts skipping cycles. I dont recall the RPS at the moment. I also have the AP V2 unit with a shaved ML bucking. 

 
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I suspect that your ZCI is an appreciably faster motor and you're getting a similar rate of fire out of yours on a 7.4 as I am on an 11.1!

With the Airsoft Pro V2, numerical values on a hop unit are now a must have feature for me. More hop?Good satisfying "click" too! 

 
Alimcd said:
I suspect that your ZCI is an appreciably faster motor and you're getting a similar rate of fire out of yours on a 7.4 as I am on an 11.1!

With the Airsoft Pro V2, numerical values on a hop unit are now a must have feature for me. More hop?Good satisfying "click" too! 
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I had to shim my plastic nub to get enough lift. It is a nice satisfying click, though 5 cant lift .25s enough, but 6 lifts them too much! I might go to .28s or .23s instead. Or drill a new hole in the adjustment wheel. 

 
Keithlag said:
No its not my m249 runs fine on a 11.1 lipo and i do up to 300 round bursts at times standard box mags no modifications the the mags at all
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With Asomodai's set up, he's probably getting 30+RPS out of his 11.1 and the mag is struggling to keep up. I've built a lower speed set up and at 23-24 RPS the mag feeds fine. With the stock motor and an 11.1v I was getting 18RPS (according to my chrono) and it fed fine. It's one of those where the answer really depends on the circumstance. 

 
Alimcd said:
With Asomodai's set up, he's probably getting 30+RPS out of his 11.1 and the mag is struggling to keep up. I've built a lower speed set up and at 23-24 RPS the mag feeds fine. With the stock motor and an 11.1v I was getting 18RPS (according to my chrono) and it fed fine. It's one of those where the answer really depends on the circumstance. 
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true my one is runing 25 rps

 
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