M79 Grenade Launcher SpudGun Project
Posted: Fri May 13, 2011 7:52 pm
Well it all started here.............
http://www.sksboards.com/smf/index.php?topic=87163.0
Well that was just a little one weekend project. It was a fun little toy for the first few shots, but now I want something bigger and with more firepower

(google reference picture)
So now comes this project. It will be a spud gun dressed as an M79. My project will be AS ACCURATE AS I CAN MAKE IT for ease of building. It will not be a high performance gun. The tests showed 70 yards with alcohol fuel. (I figure not bad for the overall size and chucking a 3oz projectile)
My spudgun will have a constant barrel to chamber diameter for realistic looks. Instead of the large chamber and skinny barrel, my gun's barrel will use a High-low pressure system inspired by the real M-79's 40mm rounds design. Instead of the typical spudgun chamber screw cap, my gun will be break action like the real M79 for refueling. The rounds are foam tipped plastic bottles, and weight about 2-3 oz. The gun will be muzzle loaded due to design features and to maintain spudgun status.
So let the fun begin.................
Rough stock shape layed out and ready to cut on bandsaw.

the two stock pieces and the final template with the barrel. Barrel is 1.5" SCH 80 and is 14" long.

The two stock pieces were epoxied together, cut to precise template shape, and then had the edges sanded on router table.

work on the front hand guard next. Made of 3 pieces of wood with some 45* cuts lengthwise to allow for barrel.

pieces epoxied together looking kinda ugly

trimmed and front curve added.

lower edges hit with router for radius. Upper edges chamfered and sanded round. Rear relief cut. Inner channel sanded round for barrel

showing fit

mock-up at the end of the day

Thoughts.......
-For some reason my stock is 1inch too long. I may fix it, or may not.
-The receiver section is gonna be a nice challenge to make
http://www.sksboards.com/smf/index.php?topic=87163.0
Well that was just a little one weekend project. It was a fun little toy for the first few shots, but now I want something bigger and with more firepower

(google reference picture)
So now comes this project. It will be a spud gun dressed as an M79. My project will be AS ACCURATE AS I CAN MAKE IT for ease of building. It will not be a high performance gun. The tests showed 70 yards with alcohol fuel. (I figure not bad for the overall size and chucking a 3oz projectile)
My spudgun will have a constant barrel to chamber diameter for realistic looks. Instead of the large chamber and skinny barrel, my gun's barrel will use a High-low pressure system inspired by the real M-79's 40mm rounds design. Instead of the typical spudgun chamber screw cap, my gun will be break action like the real M79 for refueling. The rounds are foam tipped plastic bottles, and weight about 2-3 oz. The gun will be muzzle loaded due to design features and to maintain spudgun status.
So let the fun begin.................
Rough stock shape layed out and ready to cut on bandsaw.

the two stock pieces and the final template with the barrel. Barrel is 1.5" SCH 80 and is 14" long.

The two stock pieces were epoxied together, cut to precise template shape, and then had the edges sanded on router table.

work on the front hand guard next. Made of 3 pieces of wood with some 45* cuts lengthwise to allow for barrel.

pieces epoxied together looking kinda ugly

trimmed and front curve added.

lower edges hit with router for radius. Upper edges chamfered and sanded round. Rear relief cut. Inner channel sanded round for barrel

showing fit

mock-up at the end of the day

Thoughts.......
-For some reason my stock is 1inch too long. I may fix it, or may not.
-The receiver section is gonna be a nice challenge to make
