Tuning Marauder hammer mystery: Cobble job or intentional mod?

Jump to latest Follow Reply
B

Bugman

Member
Mar 18, 2021
72
1
NC, United States
Hey all: I'm tearing down my recently purchased used 2015 Mrod .177 to understand the regulator and repair it (another thread), but while doing so I came upon this mess with the hammer. Has anyone seen anything like it? When I looked inside the pressure tube cab to adjust the hammer spring I saw a philllips head instead of the hex, so knew something wasn't right. The 2 1/4" spring below was compressed to half it's length (so very tight). 

Marauder Hammer.1619275789.jpg


It appears that the striker had been removed and a phillips head screw was put in its place and tightend in so far in that the hammer tensioner cap had no spring tension against it when dissasembled. Of course the hammer spring couldn't be adjusted since there was no acetal pin to hold it in place (it would just spin around). I'm intending to order new replacement parts. I'm worried that the threads of the hammer might have been damaged as well but will check it before I order stuff from Crosman.

If I reorder this entire assembly, am I better off buying some third party parts that might be better? My goal is to have a shot efficient, low fps (725 fps, 10.23gr) setup for pigeon control. It appears whoever altered this rifle had the need for speed and wanted to lock out any adjustments. 

Thoughts?
 
It is called an SSG (Spring Stopping Guide). It is an after market mod option to allow for a hammer gap (0.030") between the valve pin when at rest. When in stock form, there is a really good chance the hammer will bounce back and reopen the valve after a shot with all the the preload against the hammer. This wastes air per shot causing inefficiency and low shot count. It is not a very good SSG, but should work up to a point if no high power is required. This particular SSG is the arm pit of SSGs. It's silly, IMO, to have a hammer riding on a threaded bolt. There are much better designed SSGs that you can make yourself to accomplish your goals.



This is the one I made for mine. It is all internal and adjustable externally pretty much like stock, but using different adjustment tools. There are other style SSGs as well when doing a search. You could also use an SSS (Short Stiff Spring) to accomplish the same thing:








 
Upvote 0
Judging by the diameter of the wire on your spring, the previous owner did not have the need for speed. When you free flight a hammer with a SSG, you lose a lot of oomph from the spring. Usually you have to go with a stiffer spring to make up for it. My advice is to stick with some sort of anti hammer bounce device. If you don’t understand them, learn about them because they are one of the the best things you can do to have a quiet efficient gun.
 
Upvote 0
IF REGULATED .... the OEM hammers weight is excessive !!! A softer spring with the SSG is not out of line what so ever ! Hitting the valve harder that the minimum required just WASTES AIR !

Click to expand...

Yes, I intend to regulate this to around 1500 psi with the installed Huma regulator. I'm awaiting parts for the rebuild of that valve as it was not functioning properly when I picked up the rifle. Again, trying to be quiet as I can, but enough to be lethal for my pesting duties around a horse barn (e.g. 725 fps, with 10.34 JSB Exact Heavy Diablo). I have a Tatsu mounted on it as well. Any suggestion on the hammer spring weight would be appreciated. My head is spinning with all the information on this and other forums. The wealth of knowledge around here is impressive. Glad I bought the Mrod vs the new Avenger I returned recently. 
 
Upvote 0
You must log in or register to reply here.
Top Bottom
Back
Home
Forums
Resources
Menu