This really helps. I think I will do six inch barrels of 9/16 brass. Reload speed is important to me. I don't want to use a ramrod. I just want to drop them in, give it a shake, and start shooting.
And if I really want to go rear-loading, I will simply update the turret by sticking two inch segments of 17/32 into the back for tighter loading.
That's not really enough barrel length to get "good" ranges. You should check the ranges before you glue the barrels in, jsut to see if you're okay with that range. And, with it being a pump blaster, you have to consider the time it takes to ready another shot, which is also part of "reload time".
Also, you should just rear-load it right away, even if it takes a bit more work. I know that I hate doing work on blasters in segments, I like to get it all done right away. Rear-loading will be faster than tipping over the gun, and loading it from the front, even if it is airgun fit. BUT, if you follow Zaxby's mod, you will get waht is essentially each barrel couplered. They are set up so that the smaller barrels can be pulled out, then have the darts pushed into the smaller barrel, then have each barrel put back in. Kind of like speedloaders for "real" revolvers. There is no nesting action going on, it's just a plain smooth barrel, which is the 17/32". You could make a nesting effect with this, just nest 17/32" inside the 19/32" that you're already going to use for your barrels, then use 9/16" in place of Zaxby's 19/32". Then you would have the same effect that you're looking for with your future visions of rearloading, but without the turret work. You'll have to make a barrel spacer, but you'd have to do that in either case. I would suggest that you talk to Venom213? about buying a barrel spacer, you coul could get the templates on here somewhere, and make one yourself.
Also, airguns don't need pressure build up as much as springers do. They're already at "maximum pressure", just not at maximum airflow.
Brass is going to be expensive, you're looking at what, 3 feet? already? Unless you want to use this for HvZ, I would save the blaster until you are using stefans or slugs, and until you have better barreling options. And there are MUCH better blasters for Hvz.
Edited by Exo, 27 January 2012 - 01:47 PM.