ID: 26260 (SPR-STMA-M130)
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"This spring is exactly what it is advertised as. Boosted by fps (coming from a dense m120) by about 20, and when paired with better compression, I got up about 30-40 fps from stock. This was just what I was looking for. The spring's width (the wire width, not the coil width) is slightly thinner than my stock springs, yet is much heavier. This means it is more flexible sideways, so expect some resistance when trying to line it up in your gearbox. In my case my spring guide does not allow a screwdriver to go into the gearbox, so I have to put the spring in by hand, and MY WAS THIS HARD. I have figured out a method to get it in safely now (after 12+ times of disassembly and reassembly), but earlier it could very easily wreak havoc on my gearbox every time it bent around itself when compressed.
All in all there is not much to say, other than it is a true heavy irregular pitch spring of good quality.
"So... This is a good spring. That said... Story: I have a DMR build and originally had put a m140 spring in at the time i built the gun. Did some test shooting after it was all put together and it seemed as though the gun was shooting over 450 (D14 DMR Field Limit) just by observation. So i order this spring as a downgrade. Slapped it in there and said there. That should be good, without testing it. Went to an event the upcoming weekend and walked up to the chrono. First shot 500 FPS exactly. Second shot 497. Third shot 500. Puzzled i told the chrono man it had a m130 spring in it. He was puzzled as well so he put a different fresh mag in. pew 500. Shot again. 490. So in disbelief i stripped my gun down on the bed of a truck, opened the gearbox and slapped a m120 in. Chrono 350 FPS steadily +/- 4 FPS. Took my gun apart again and put my m140 spring in and chronoed. 410-420 FPS Steady. I have no idea why this spring is shooting so hot in my gun but definitely does the pew pew more than advertised. I understand it was a new spring so it would be shooting hot before it settled but thats a little extreme for a m130.
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