I am a proud owner of a M324 for several years now. I have experimented and tinkered with this baby for quite some time and learned a lot of things. I have decided to share my knowledge in this topic.
Gun specs:
Type: Bolt-action, Tokyo Marui VSR-10/US Army M24 Sniper Weapon System Clone
Stock Power: ~1.6J, *400-430 FPS @ .20g
Barrel: 464 mm aluminum, *6.14 mm diameter
Weight: ~7 lbs stock
Available Upgrades:
EdGi
•UTG M324 V3 6.01mm Barrel $75.00
•UTG M324 V3 6.00mm Barrel $80.00
•Heat Treated Steel Sear Set $50.00
•7mm Steel Spring Guide $32.00
•Anodized Alloy Piston $60.00
•525fps Spring $22.00
•585fps Spring $22.00
•Cylinder & Cylinder Head $75.00
+ Flat-rate shipping $10.00
EdGI may also offer discounts on complete kits. Please contact them via email or telephone (found on their website).
DBCustoms at AirsoftGi, ($45.00 witgh flate rate shipping) 6.01mm'
LayLax springs at Airsoft Atlanta
•Laylax VSR-10 120SP Spring $17.99
•Laylax VSR-10 130SP Spring $17.99
+ Airsoft Atlanta Shipping (shipping varies)
You can get higher rated springs but I would NOT recommend it due to the flimsiness/lack of durability of the plastic trigger mech.
The rest of the post talks about the M324's custom bucking which is not compatible with any gun or upgradable.