marushin randall advice propane

[croc1]

Ive recently purchased a maurshin randall, if i put 134a in in runs ok apart from very low powered ive read you can use propane on them but when i put propane in it wont fire i have to let say half the propane back out before it will work then as there is not as much pressure there, its no more powerful then the 134a , the only thing i can think is the propane is to much pressure for the hammer if so is there a mod to solve this ( just trying to get a little more fps)

[jonny lovegrove]

Re: marushin randall advice propane

you've nailed it, you need a stronger hammer spring (have fun with that)
Or try a middle of the road gas like ultraair or predator ect?

[croc1]

Re: marushin randall advice propane

Cheers thought so, if i change it to a stronger spring is there anything else that will need upgraded to take the extra pressure from the spring

[jonny lovegrove]

Re: marushin randall advice propane

not that i know of, just check the working parts now and then.

[Apurturesci]

Re: marushin randall advice propane

Yes the hammer spring is the issue, I also drilled the hole out that the gas is delivered through which gave it a bit more punch. The issue you will undoubtedly come across though is leaking. Mine was ok on 144a, but using Abbey Ultra triggered an almost-irreparable leak. After months of trying to seal it, and many bottles of gas wasted, I finally sealed the whole thing with silicone sealant (permanently). It's held up well and it a good shooter, but it recently snapped part of it's loading piece so won't feed. One of my favorite guns, but it is delicate so be careful.

[croc1]

Re: marushin randall advice propane

Ive allready gone over it and sealed up for extra strength, i have put a washer in the hammer spring to pack it out a bit and thats done the job ,now fires on propane and has alot more power :-)