M1A to M1 Garand

[the radium king]

trying to understand this.

if just the need to shorten the op rod, then cutting it and brazing on a new end shouldn't make enough heat to affect the temper, expecially where the tube and the handle are welded. worst case, cut it, thread it, and screw a cap on it.

i think the issue might be alignment. if you look at the mock-up image posted earlier, the garand op rod might run at a different distance from the barrel than the m305 op rod. if so then you are looking at much more customisation to the grand op rod. or, as mr stacey stated, use m305 components that distance the gas system from the barrel differently?

 

[darkphe0n1X5]

There seems to be many people who are confused over how these hybrids work.

OP: As Tiriaq correctly stated, the barrel threads are the same and will thread on to the receiver. As also mentioned, barrel indexing becomes the next issue (a small amount of the barrel shoulder may need to be removed for correct barrel timing).

The hybridization of parts is where people get most confused. Sure, you can start mixing and matching parts and getting into strange combinations of the op rod, etc. however this is excessively complex for creating a Garand back-half, M1A/M14 barrel and gas system IMO. (not talking about mag fed BM59 style)

Building one of these hybrids has been discussed on thecmp.org (google garand m14 hybrid) (And also as shown by HeadDamage). The op rod and stock are the two major pieces that require major modification. The Garand stock needs to be lengthened by grafting on additional wood. The Garand op rod needs to be cut down and a hard plug soldered in. There are other slight modifications that need to be made to the follower rod and a new op rod guide may need to be made.

I am currently building one of these hybrids and will be posting a more detailed explanation when I have finished.

While it might sound like a simple swapping of parts to some, I can assure you it isn't as simple as "assembling" an AR platform. This isn't rocket science but a good understanding of how the systems operate goes a long way in aiding one understand how these hybrids work and what parts need to be modified/made.

Cheers,

dark

 

[Beretta Armorer]

You would have to adjust the M1 op spring for the correct recoil force for cycling,

and use an adjustable gas plug for final tuning may have to alter the gas port size also

I have done all of these things for shortened "tanker" M1's


G

Yes that is what is described in the M1-305 pictured. The nose of the M305 op rod, and just enough of the right outside profile to go from under the barrel to beside the barrel. And enough of the hollow M1 rod for the spring and cartridge lifter arm, and then the cam section back end. It would take some paperwork to understand. My concern would be to get the M1 to cycle with the M305's piston force.