My sig with silencer, extended tbb (6.03) and upgraded spring (m100) has the perfect balance for shooting .25 bbs. This outperforms my brothers m4 shooting 409 fps with a tbb (6.04).
If your bent on the m120 then whatever. But I seriousley recomend just getting a m100 and a tbb cuz the fps isn't that important, consistancy is. And believe it or not all the pros on here think that 360-380 is the sweet spot for shooting any aeg, and thats with .20 bbs.
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Con Murder
Dark Rhino
L.A. Airsoft
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