MDD and RWA chambers both work just as well as the original chamber. Major gain is going to be the hop mod. But you also have the huge convenience of adjusting hop from the ejection port.
Stock barrel is fine, only downside is it's brass and can scratch or tarnish.
PDI stainless 6.04 would be the best bet.
PDI 6.01 is overkill
Orga 6.10 performs just as well as the stock 6.04, but you need to play with volume to barrel ratios to get it to work right. Costs just as much as the PDI 6.04, and it's teflon coated brass or some such thing.
Orga 6.23 is just a ridiculous concept and shame on the Japanese for failing so hard.
Mixed review on orga flat adjuster: some say they're great, some say they're great and wear out REALLY fast. Flat hop in a ptw doesn't quite work exactly the same way in an AEG. Explanation is complicated but in a nutshell it's a loading/design issue.
I've managed an Rhop out of an orga flat adjuster as well, same results as the orga flat and hop mod, more of a pain in the ass.
In the end, regular hop mod works best.
The only stock adjuster that has consistently good reviews from everywhere is the orga flat. Only downside is it might wear out after 6000 rounds, but the pads are cheap to replace.
I've got everything to overhaul PTW's here in Calgary, and Brad's been just dying to touch anything airsoft since he's bored to tears out in GP.
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