Lothar Walther ready to go for the AR/QBD

[sholo]

I don't want to hi jack your thread , but seeing as it was you who asked....it's nothing special, just a skeleton version of Bob's 2260 HPA (which I used as a guide), and still a work in progress. My first HPA build where I did all the work myself - with my limited tools! (valve, HPA setup, shroud, etc...). Figured if I was going to learn how to do it right, I may as well learn from one of the best. Hope you don't mind, Bob! Not as hot as Bob's, though - 14.3 gr Benji HP @ 957 fps, 16 gr Polymag @ 930 fps.

...And before anybody gets excited about the shroud - it's purely cosmetic (no baffles or such). Unfortunately, it still sounds like a .22 lr... Now, if you want to see some real quality craftmanship, check out the fancy butt pad!
2260hpa 007.JPG

Todd

[SeanMP]

The reason for the longer socket is I've never been totally happy with the barrel stability. Another inch would improve this dramatically and give a longer fulcrum for 2 set screws

[SeanMP]

I just did some quick trig to get an idea of what the impact of a single set screw screw could be.

If side a is 0.001" (this is the clearance between the breech socket and the tenon
And side b is 1.25" (the length of the breech socket
And it's held together by a single grub screw which provides a pivot

Then the side a magnified to 100 yards becomes 2.88 inches

However in reality they are much looser than 0.001. In fact I have 0.006" of shims stuffed in one
That 0.006 becomes 17.25" at 100 yds

Holy cow