RIF chrono at 275fps on 0.25g, a bit lower than expected but shoots good. Haven't tested out all the ETU functions yet, but performed well on semi and full auto at Dirtydog Airsoft last weekend. M-LOK grip is comfortable and with a few extra attachments managed to run my 2 point sling, mount hit cam and optics and exchanged the muzzle suppressor with my tracer unit. Battery fits snug in the buffer tube.