Nap Posted March 6, 2021 Report Share Posted March 6, 2021 Has anyone tried to fit an M3 Grease gun with shortened M-1 Garand Op Rod springs to increase the rate of fire? This was suggested in a "Battle Experiences" circular issued by HQ US Army ETO on 16 March 1945. It appears that the M-1 Garand Op Rod springs are too small to fit over the M-3's guide rods. Thanks Nap Quote Link to comment Share on other sites More sharing options...
Got Uzi Posted March 7, 2021 Report Share Posted March 7, 2021 Never heard of that one but I have heard of guys using a pair of Thompson springs to increase the bolt speed. Quote Link to comment Share on other sites More sharing options...
b_san Posted March 8, 2021 Report Share Posted March 8, 2021 An integral suppressor noticeably speeds up the GG, chuga chuga chuga turns into clackclackclack... Quote Link to comment Share on other sites More sharing options...
Got Uzi Posted March 8, 2021 Report Share Posted March 8, 2021 That’s due to increased back pressure forcing the bolt back faster/harder. Same doings but more back pressure Quote Link to comment Share on other sites More sharing options...
Babyface Nelson Posted March 10, 2021 Report Share Posted March 10, 2021 Wouldn't this action compromise the aft end of the receiver shell where the recoil spring rods protrude? Quote Link to comment Share on other sites More sharing options...
Got Uzi Posted March 11, 2021 Report Share Posted March 11, 2021 Speeding the gun up would indeed cause an adverse effect to the back of the gun. Quote Link to comment Share on other sites More sharing options...
macvsog Posted March 31, 2021 Report Share Posted March 31, 2021 A good number of years ago, I experimented with Thompson SMG springs. They worked pretty well. I cannot remember who wanted to put a kit into production, but I had a bunch of Thompson springs and a timer/round counter that I used. I was trying to come up with a specific length of spring for a specific ROF, but I got tied up in other things. I did the same thing with the buffers that are available to change the ROF of Uzi SMG's. Get you some Thompson springs and work on determining the length that you need for a specific ROF. I had an M3A1, so the longer springs made it difficult to pull the bolt back with your finger. I like a ROF of around 750 RPM. I get that with my Uzi and I had that with my M3A1. I never took into consideration that this might beat out the back of the Greasegun. You can get away with it if you do not do a lot of shooting with the stronger springs in it, but my experimentation was back when Post May Sample M3A1's went for $200 each, so I was not too concerned about it. With the price of full auto guns now, beating up your weapon is definitely something to consider. Charles Tatum Alamo Professional Arms Quote Link to comment Share on other sites More sharing options...
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