Gas Blowback Rifle (GBBr)- alot of brands are making their own GBB Rifle System, such as the VFC, WE-Tech, GHK, WA, KJ Works, and Viper GBB System. Most of the parts are easy to be found in SIXmm.com. Spring, buffer tube, Bolt Carrier and other hammer set.
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Very good, I thought it would be light as hell but it isn't its actually in between so it's not light but not heavy and you can swap the folding mechanism upside-down and it down affect it.