Matrix Hopup Bucking for Classic Army Echo1 A&K M249 SR25 & Compatible Airsoft AEG

"Ordered 4 at one time, and each was a little different. While the bucks themselves appear ok; one came with a good solid black nub/spacer, one with soft clear conventional tubular (thinner than the one seen in the picture) nub, and the other two had no nubs at all. With the unconventional layout of the M249 hop-up unit, having a good stiff nub in critical. With this bucking, it's hit and miss what you will get.

"Picture showed the little nub. This indicated to me that it came together. Not the case. That should be noted somewhere if it is not included or maybe get it out of the picture. Either way that earns a fat 2 rating from me.