The MP5SD5 sports an SEF trigger group. Classic Army also sports a full metal receiver and front cocking tube, metal silencer. Uses Classic Army gearbox and parts but sports a genuine Tokyo Marui motor. The firing action is a little less smooth and fast as the Tokyo Marui AEGs but the full metal body gives this gun a very realistic feel. Is compatible with all original and aftermarket parts intended for Tokyo Marui MP5A5. Fixed stock accommodates larger battery. Power is slightly higher than Marui's AEGs at 280fps.
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Consider also getting a larger MP5 standard magazine for 50 rounds of capacity, or a 200 high capacity magazine. A 3 point tactical sling also enhances tactical use. Installation of a scope mount then allows easy installation of a scope. Consider getting a tracer unit which replaces the stock silencer unit.