I was looking at 3 different kynshot buffers and I was trying to figure out the best way to test what is best for double tapping with a 10" barrel and 6" brake (100g & 115g) and a 5.5" barrel and brake (124g & 147). Sumply watching the dot bounce is difficult to judge.
1. 5015, Orange Spring, and buffer tube spacer.
2. 5020, Red Spring, buffer tube spacer, A5 tube.
3. 5006, JP Polished Carbine Spring, buffer tube A5 Tube.