Help! Extremely stiff bolt pull on Well MB01

[BenBurnside]

When I pull the bolt back on my Well MB01 it is extremely stiff and requires a lot of force to even get it moving. Once I get it to slide its still very stiff and seems to make a grinding noise I have upgraded it internally slightly. I think I might need a new cylinder to fix the issues but I’m not sure. Hope someone can help All my upgrades: with ASPUK metal piston and spring guide, 90 degree trigger sear, 150 spring, and a new piston head and o-ring.

 

[proffrink]

My guess would be that you've assembled your cylinder incorrectly or have put the spring retention pin/set pin (from the trigger mechanism) back incorrectly during reassembly.

Look up a video and be sure that the set pin is correctly placed. Looks like this:

 

[M_P]

Sounds like Proffrink is right, take it apart and put it back together again, making sure all is in the right order, 9 times out of 10 that fixes these kind of issues

 

[Georgeturner2001]

Extremely stiff and requires a lot to get it moving....sounds like my grandad! 

 

[BenBurnside]

Okay thanks for the help!