Mann Accuracy Device

[noid]

So I got into collecting C&R stuff in the late 90s. Not quite the good-good old days, but there was still plenty of cheap surplus on the market. Enfields were 100 bucks. I once scored a Hungarian M44 for 30 bucks as an 'add-on' when making a SOG order. There were also still a lot of oddball firearms floating around at that time and this is one of them.

The Mann Accuracy device was designed to help test ammo accuracy. The device was fitted into a tube or a v rest (also known as a Mann rest). Ammo to be tested off the line was then loaded and fired. Provided the correct number of rounds hit the fixed target down range, the batch was considered good to go. Over the years these were produced in '06, 7.62x51, .30 Carbine, and 5.56mm. They even made them in some non-military cartridges like .22 Hornet. A lot of them 'went home' with their owners and they largely vanished from the market for a spell. The CMP came up with a bunch at one point in .30-06 (which this one is) and I was quick enough to grab one. 

If you search around for these, you'll find some folks have leveraged that super heavy barrel to turn them into target rifles. I'm curious if anyone else has one, especially if it's in a different caliber.

[Defunct Ammo]

What in tarnation is this monstrosity?! This is really cool. Thanks for sharing!