[harley guy]

thumper

it is legal as far as our local atf office is concerned. the orginal design of the gun was not altered, the serial number on the receiver is very legible and was told no problem as long as i did not try to make and shoot projectiles with some kind of charge. i must admit i have not read the atf rules and guidelines because i just call them and ask any questions i have. they have advised me twice in the last 15 years that i was fixing to enter no mans land with some of my experiments and i dropped those two ideas. atf has always been very helpful and courteous to me although i understand somepeoples feelings are different. right now i am using neoprene bullets and they are retreivable, i dont have to go home after five shots. just powder up and shove it back in and go again. am not aware of any calibar limits. a guy in las vegas has bowling gun for sale. it originally was a hydraulic cylinder and he discovered a 16 lb bowling ball was a snug fit. this thing shoots a 16 lb bowling ball 900 yards. price 4000.00 dollars. that thing surpasses my weatherby 41 mag thompson contender or my 20mm shouldered rifle as being a bigger nut than i am.. as far as i know i am legal and will try to keep it that way.

 

[harley guy]

thumper

i appreciate your concern and realize atf does not have a reliable track record. i was going to look at building a true m79 from mr. shivak but was advised by our local atf that paperwork was involved and approvals from their office was required. that is the whole reason i went this route. it is still considered a shotgun. i am going to work the stock and forend over to more m79 dimensions as soon as i get the distance and accuracy bugs worked out. will try to post a picture then. again, thanks for the concern.

 

[harley guy]

homemade thumper

took my homemade thumper to our latest gun show for display only. had quite a few lookers and several vets remarked it looks like a real thumper from across the room. they were really amazed at the size of the shell casing and projectile. had a lot fun discussing the pro and cons of my project and was pleased to see that all efforts werent in vain. still not finished contouring the buttstock and forend to more 79 dimensions. will try and post a pic when i get it finished.