Beeman Beeman underlever 1358 mods

Jump to latest Follow Reply
joefos71

joefos71

Member
Feb 17, 2025
11
4
Hey everyone I've been messing with my Beeman. It's my first PCP. I'm an engineer and a tinker so I've taken it apart a few times and made some changes.

I opened up the main valve and made that spring a decent amount weaker. Right now I want to get a little more power. I also added a o ring in the block before the hammer which takes off some for but helps with hammer bounce. Over all I still get 50-60 shots but my curve isn't as flat as it was with the stock valve spring. I also recommend removing the brass washer on the valve spring to make it a little softer. It's STIFF.

My main struggle is that I can't get a reg to work on my model because of where the pressure gauge is. Does anyone know where I could source a gauge block? I would also accept a drop block to add a bottle of anyone can help me source one.


I would also love to find some barrels that fit this receiver. I'm sure a few models work, but I don't know where to buy them.


I've been 3d printing some mods. This one has lasted the longest so far.

But I'm trying some. Resin printer parts too.

17410250447181774981458823385680.jpg


17410251024737959843314900602614.jpg
 
  • Like
Reactions: Tackleberry, JimT66, beerthief and 1 other person
I just picked up one of these rifles myself, couldn't pass up a 22 caliber PCP rifle for $215 on Amazon. I will be doing to of the easy mods, first the trigger return spring. Second shorten the op-rod by removing a few threads off the trigger end to shorten the first stage.
Have you gotten rid of the "thawk" after firing? I believe it is hammer bounce, but I am not sure.
Nice job on the stock the Blonde color looks nice. What did you use to strip it?
 
Upvote 0
Tackleberry said:
I just picked up one of these rifles myself, couldn't pass up a 22 caliber PCP rifle for $215 on Amazon. I will be doing to of the easy mods, first the trigger return spring. Second shorten the op-rod by removing a few threads off the trigger end to shorten the first stage.
Have you gotten rid of the "thawk" after firing? I believe it is hammer bounce, but I am not sure.
Nice job on the stock the Blonde color looks nice. What did you use to strip it?
Click to expand...
It's hammer bounce you will need to make a ssg for it, there is a post on here somewhere on the how to. You can also use a shorter heavier hammer spring. It will get rid of the noise and drastically increase your shots per fill.
 
  • Like
Reactions: Tackleberry
Upvote 0
Neu said:
It's hammer bounce you will need to make a ssg for it, there is a post on here somewhere on the how to. You can also use a shorter heavier hammer spring. It will get rid of the noise and drastically increase your shots per fill.
Click to expand...
Great thank you for the reply. Any idea where to get a shorter hammer spring? I will hunt around for the post here. Thank you again
 
Upvote 0
Tackleberry said:
Has anyone seen or know where to down load a exploded diagram for the 1358? I would like to change out the hammer spring but I am a little leery of just unscrewing the power adjustment bolt not knowing what else is behind the screw.
Click to expand...
Your good to remove it, nothing else can move other then the hammer .
 
  • Like
Reactions: Tackleberry
Upvote 0
You must log in or register to reply here.
Top Bottom
Back
Home
Forums
Resources
Menu