Quote:
Originally Posted by Oz
As for reliability, theres the odd missload or a shell failing to eject fully but all in all its pretty solid. I did some work on the ejector and it only seems to have issues if I rack it limp wristed or too quick and catch the shell on its way out. If anyone has a source for extra loading ramps I would buy a box though. I'm seriously considering having some CNC'd as the only one I have at the moment is missing one of the arms. (Max I'm looking at you!).
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Man that part is such a pain in the friggin ass. It's a complex shape that has long thin flexible features that are a bitch to machine (too much part flex). I was considering having that part duplicated in steel with sand casting, but gave up on the project when my shells started dropping bbs. Dropped bbs kept finding their way into the loading gudgeons. I started doing statistics and found I had a misfeed 1/15 of each shell loading either due to a jammed shell or a dropped bb with each roughly the same frequency. Then about 1/100 of my shots started to overpressurise the shell so their front wall would blow out shooting plastic and rubber bits downbarrel and jamming the breech.
All that made me give up on the shell loading mechanism. I could have machined custom stronger shells with stronger bb detents, but it was just too much work to make shells and refine a not very robust loading mechanism.
Someday, my plan is to graft a G3 breech onto the bottom of my rifle and load from G3 locaps and not eject exploding shells. I've got some ideas for a bolt design which would not fire from a short breech. I have to make sure that full power would not be applied to only 1 or 2 pellets in the case of a short load. I had concerns that I could accidentally load a short shell when I played my 870. I've chronied single 0.43g pellets out to 550fps on my build. Triple 0.36g was pretty cool whizzing out at a hot 360fps. 10x 0.25 came out at 270fps which was very combat worthy. Still the very hot short load was a safety concern that prevented me from continuing to field my shotty.
October 2nd, 2007, 00:48
