Quote:
Originally Posted by ThunderCactus
The whole time I had a vsr I just used a firefly hop and the stock chamber, I'm sure the PDI/action chambers are better, but I wasn't left wanting any more accuracy...
The action chamber looks good, but the PDI has dual hop arms in case of deviancy in the hop rubber. Of course that usually means you installed the hop rubber incorrectly.... lol
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The PDI chamber actually has a lot of issues. #1 would be that the actual pressure is applied by an O-ring being used as an elastic, the adjustment holds reduces the tension on the bucking by limiting how far the o-ring can drive the arms down. Main problem with that is the o-ring wears and also is sensitive to environmental factors.
Having the twin arms themselves can make you chase your tail in terms of eliminating BB hooking when you should just be looking at your bucking install. You are totally right that a properly installed bucking helps but overall the VSR hop-up puts asymmetrical pressure on the BB. That can be greatly eliminated by shimming the stock arm.
The AA chamber pretty much eliminates all of that along with offering excellent feeding and perfect airseal out of the box. There is a +10 page thread on them over on ASSF, universally loved.
-Grant