We m14 (gbb)

[Crazydan123]

Hi

My friend has recently bought a M14 GBB. He Took it to a skirmish and he got it chronograph and it kept reading at 150 FPS. It said on the site he got it from the gun would shoot at 340 FPS with green gas, but he was using Propane.

Now The weather didn't have a massive affect on it as, it was not hot but it was around 15 degrees, and he was using 0.2g bb's. Does anyone know what the problem is?

The gun also came with a bigger magazine spring to make it to 30 rounds and a long spring, does anyone know what that if for as well?

Thanks