New Proto Matrix Rail back cap. Replace your old stock plastic back cap with the new CP. Made of aircraft grade aluminum, the CP PM Rail back cap vents 40% more air than the stock cap. This increases bolt cycle time allowing for more ball per second.
The Custom Products PMR Back Cap is newer, so it should be commonly available, both new and used. Check out the Places to Buy links below for places to purchase it new.
pmr with cp 2 piece barrel system, cp on/off, cp, back cap, ndz feedneck, stock halo
Made of metal, and it does vent more noticeably than stock.
Heaver than stock
Its just a back cap so that leaves little room for positive and negative feedback but i'll try to give a good review.
I've had this product for a few months now. I needed it because I did the inevitable and stripped the stock one. It is heavier than the stock back cap if you were to hold one in each hand, but its way more durable. You won't feel it once its on the gun. I havent had any problems out of it except for one time when i noticed it was slowly coming unscrewed. A lot of pmr owners have reported this incident with different brands of back caps so its not just limited to this one. I havent done this but it would just make sense to put a little teflon tape on the grooves of the cap to fix this problem.
I have noticed that it does vent more air than stock, but I really havent noticed an increase in my bps. It could be there, but the pmr is so fast in the first place how could anyone really tell? If you're worrying about it making the gun less efficient with all the air it vents, you didnt really buy an air efficient gun to begin with. Besides, most fields have all day air so it shouldnt be something to worry about.
Overall, i am completely satisfied with this product. I mainly bought it as a durable replacement for the stock cap that got stripped. It does vent more noticeably than stock (like havin a fan in front of your face. Ah, feels great in the summer time haha) so i guess its possible that it increases my rof a little without my notice. Great product, great company. If you're thinking about this product, think no more. buy it!
Proto Matrix Rail, Smart Parts All American Barrel, NDZ Slik Trigger, CP Back cap, NDZ Feedneck, Pure Energy 68/4500
Aluminum-does not strip
I haven't found one yet
I needed to replace my original backcap because it was stripping when the bolt got stuck after I broke an o-ring. I didn't really have a brand preference, so I just went with this on becasue it advertised that it vented more air. I put this cap on my marker and went directly to the chrono. Before I swithed the backcaps I had my gun set up to shoot in the 280's. After the switch and with no adjustments, my gun was shooting in the 330's. I'm not really sure why this would happen or even if it a "good" thing, but it definitely made my gun shoot hotter. Well, after the adjustments the back cap has worked fine. It has only come loose on me once, but that was my fault because I wasn't even checking it after each round. I have had no problems with it, but I also haven't really noticed the gun shooting any differently after adding it.
It definitely made my gun shoot hotter before I made any adjustments, so I guess the 40% more air venting makes a difference. I am pleased with this backap so far, but I haven't really noticed a difference since the first day. I bought it to replace the original plastic cap and it has been working fine.