Evaluated the RB FRT-15L3 and Disruptor
Title says it all. Bought both the RB and Disruptor and evaluated them both this afternoon at the range. I was purely focused on function and reliability, not accuracy. RB was in a 14.5 XM177E2 clone with a std carbine spring and an H3 buffer. Disruptor was in a 11.5 also std carbine spring and H3 buffer. I did 3 round bursts and mag dumps on both. 200 rounds of std 55 grain 5.56 M193 ammo. Both are generic PSA lowers with M16 BCGs
Both the RB and Disruptor had *zero* fails. No FTEs, FTFs or light strikes. Both ejected the brass at around 3:30 or 4 o'clock. Cyclic rate was identical- not too fast, very controllable.
The only difference between the two was this- the RB came with a little extra hardware (two small star wrenches and some extra screws) and the housing for the RB was (to me) built a little tougher.
Disruptor was pretty bare bones in the package (just the trigger, safety and antiwalk pins/screws) and the frame was cut a bit lower- in my view a little less robust.
Final verdict for me- Get the Disruptor. It functions identically to the RB and is 200 shekels less. The extra cost for the RB didn't justify the small mount of extra hardware. Of course I still have to see about long term reliability, but I don't foresee that being an issue going forward. Both seem to be engineered well enough to tolerate the forces involved during FRT function.
Also- H3 buffer is a must if you want to use these reliably. You *might* be able to get away with using an H2 but your cyclic may be too fast which can cause FTEs or FTFs/light primer strikes.