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mcguyver · August 22nd, 2006, 23:25

Stick to about 360 fps if you want a good balance between performance and durability. The performance difference between 360 and 390 is minimal, but Marui mechboxes are not really built to withstand 400 fps ranges for very long. There are a few guys who've never had a problem with many rounds at 400 fps, but personally I've thrown away a few damaged mechboxes due to an M120 spring.

Silent head sets can help dissipate some of the spring's energy over a larger surface at the impact point point between the heads, but as the cylinder head still makes the exact same contact with the mechbox, it really doesn't do a thing to help out the mechbox.

You may do best as Droc has said to get a Systema complete mechbox with an M120 to give you about 400 FPS. It's overall the best deal and it's pre-assembled. Makes your life easier.

August 22nd, 2006, 23:25	#5
mcguyver Trader rating Join Date: Aug 2005 Location: Northern Alberta	Stick to about 360 fps if you want a good balance between performance and durability. The performance difference between 360 and 390 is minimal, but Marui mechboxes are not really built to withstand 400 fps ranges for very long. There are a few guys who've never had a problem with many rounds at 400 fps, but personally I've thrown away a few damaged mechboxes due to an M120 spring. Silent head sets can help dissipate some of the spring's energy over a larger surface at the impact point point between the heads, but as the cylinder head still makes the exact same contact with the mechbox, it really doesn't do a thing to help out the mechbox. You may do best as Droc has said to get a Systema complete mechbox with an M120 to give you about 400 FPS. It's overall the best deal and it's pre-assembled. Makes your life easier. __________________ Age verifier Northern Alberta Democracy is two wolves and a sheep discussing what's for dinner. Freedom is the wolves limping away while the sheep reloads. Never confuse freedom with democracy.