Industry brand B3 and know as a Cummings due to the Cummings Truck tool sale, $19.00.
Also a Sebring convertible battery removal tool, and, keeps on ticking. Well worth the price for the adjustable dovetail rear sight (t least back when.
in 2000 still had a leather seal and a few people sold modern replacement seals.
This one was apart for a seal replacement when the misses needed it.
Which inspired me to put it back together and play with it some more
And after tinkering some more,
A 1/2 minute of can shooter (as far as you can throw an empty can)
Personally would be another IF still $19.00. I did know a machinist (BigEd) who with 20 minutes work got his shooting 1/2" at 25 yards & high 600fps numbers.
WE had ours in TN 20 years ago and as far as I know it is still in use. Not a bad little rig, perhaps not worth $1,000 (hahaha) but a fun little rig.
John