On a side note, I'm really enjoying this exchange. I made an assertion and people are trying to verify or falsify my claim . . . the scientific method at work! Based on your comments and dedicated detective work, it appears that my assertion is only valid for the Bond Bullpup, but not for the Bobergs.
Anyway, someone with a Bond Bullpup, line up a cartridge so that the base of the case is even with the back edge of the magazine and see if you can get it stuck. You can see in the videos (review video above, and analysis video included here) that's what I did, and doing so produces a consistent lock on the Bond gun, every time. My snap caps and live ammo caused a lock with as little as 1/8" (more or less) of rearward movement - I think the variability in location may be based on minor production variations from one mag to another.
Someone with a Boberg, take the thing apart and see if there's a lip at the bottom of the bolt face. I've never owned one, so I'm not as familiar with what that slide assembly looks like inside.
You folks with Bobergs might also try what I did to finally figure out the problem - do a paper test. Wrap paper around the top round, load the magazine and drop it again, then shift the round slightly (again and again) until the round is as far back in the magazine as it can possibly go while still being able to load the magazine in the gun.
Chances are you'll see the extractor tongs cut into the paper exactly where they're supposed to when the round is positioned correctly. That indent on either side of the round will shift as you move the round to the rear (of course).
If someone with a Boberg would care to try the paper test, I'd love to see your results.
At a certain point on the Bond, the lip at the bottom of the guide ramp cuts into the paper, ahead of the case rim. That's a lock.
I don't know if a Boberg will have the same problem. It's a slightly different gun and there's no telling what Bond changed when they took over.
In this video, I had previously assumed the extractor tongs were exerting pressure on the barrel or the locking block (thus, my comments about them toward the end of the video). Further analysis indicated the effect of the tongs was negligible (if any), and that it was the guide ramp lip that was causing the problem.
If you go through this process and never succeed in getting the guide ramp lip to engage in front of the case rim . . . congratulations - you're probably not holding a Bond Bullpup.
Anyway, someone with a Bond Bullpup, line up a cartridge so that the base of the case is even with the back edge of the magazine and see if you can get it stuck. You can see in the videos (review video above, and analysis video included here) that's what I did, and doing so produces a consistent lock on the Bond gun, every time. My snap caps and live ammo caused a lock with as little as 1/8" (more or less) of rearward movement - I think the variability in location may be based on minor production variations from one mag to another.
Someone with a Boberg, take the thing apart and see if there's a lip at the bottom of the bolt face. I've never owned one, so I'm not as familiar with what that slide assembly looks like inside.
You folks with Bobergs might also try what I did to finally figure out the problem - do a paper test. Wrap paper around the top round, load the magazine and drop it again, then shift the round slightly (again and again) until the round is as far back in the magazine as it can possibly go while still being able to load the magazine in the gun.
Chances are you'll see the extractor tongs cut into the paper exactly where they're supposed to when the round is positioned correctly. That indent on either side of the round will shift as you move the round to the rear (of course).
If someone with a Boberg would care to try the paper test, I'd love to see your results.
At a certain point on the Bond, the lip at the bottom of the guide ramp cuts into the paper, ahead of the case rim. That's a lock.
I don't know if a Boberg will have the same problem. It's a slightly different gun and there's no telling what Bond changed when they took over.
In this video, I had previously assumed the extractor tongs were exerting pressure on the barrel or the locking block (thus, my comments about them toward the end of the video). Further analysis indicated the effect of the tongs was negligible (if any), and that it was the guide ramp lip that was causing the problem.
If you go through this process and never succeed in getting the guide ramp lip to engage in front of the case rim . . . congratulations - you're probably not holding a Bond Bullpup.
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