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I have two bolts and as of today a KWA ERG. In my opinion the KWA is the best feeling and most solidly built AEG M4. Bolt has better compatibility and technically better stock internals. Without further information on what you're looking for I'd recommend the KWA over the bolt, but in some situations the Bolt would win out.
I plan to create a well documented tuning and compatibility guide for the RM4 as I build mine up as I haven't been able to find much information on tuning this system.
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