Thank you guys for your comments.
RA-TECH Is to expensive for me. Steel Bolt carier cost 140 USD. ELEMENT's cost 64 USD.
I never shoot on Auto mode its useless.
About the spacer I already got one so it very close to not catch the bolt. I think if i will change the spacer from sponge to metal the absorption will be less - more felt recoil.
Changing to real spring will cause to damage and failures in the blowback system. It's just too strong and if you shorting it the base will be unsimetric.
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