g&p m870 spring downgrade

[Hectic]

Originally Posted by Kos-Mos

All APS springs under 120% are "7mm" compatible.

also, a SP120 (LayLax SP120) will give you around 400 fps (in a BA). A SP100, should be sub 350.

but they would be too long to start and would need to be cut so its hard to choose based on the fps the sring provides in its original state.

@OP
you can put some kind of spacer inside the piston where the spring rests if it it too loose / rattles around or even jb weld it to the piston tho thats a lil more permenent and will effect your final fps as well cause the piston likely wont travel fully forward so itll have a shorter compresion cycle, a spacer would be beter, id say maybe s lid off of somethin like a pop bottle (probably too wide) or off of a trave sized shampoo or hand cream. Check the doller store i think they have a lil travel kit thing with a few diferent sized bottles, or even home depot check out diferent sized "caps" for pvc plumbing pipe

[Ross]

and then of course there are videos like this that show the gun shooting cqb levels. G&P M870 Mad Dog Shotgun (Shorty) - YouTube

[Hectic]

yeah but you see the next one shoots 370+
the low power one was likely the japan export version or it had a bad ass air seal.