Originally Posted by
bigtoe01
so to conclude this, a transfer port is needed, we can not rely on the pellets to form the restriction to build the pressure consistently.
I am now thinking bore the end plug to form a 2mm long port, use a 300S conical breech seal and machine the barrel to suit, unless we can decide on a similar setup to what Dave is already running that would have zero air waste...i have one idea but will need to do a test machining on a scrap barrel to be sure it would work...it would be similar to how the HW100 barrels used to seal but with a little gripper groove for the O ring.
Boring the end plug maybe easier on the mill using an end mill, pilot drill first to size on the lathe then drop the end mill in to just flatten the bottom of the hole.
2mm is needed for strength, if we could get the barrel to sit exactly onto the face of the TP the O ring idea i have would work beautifully.
The 300s method is easy enough to replicate, tbh I'm thinking along the lines of a slightly longer port now due to the volume.
I have a HW100 somewhere, I'm struggling to visualise the sealing method, it can't be difficult to do, after all it's only machining.
IF IT'S NOT BROKE.........DON'T FIX IT!