So yesterday I changed the reg settings on a stock pr900 to shoot 10gr jsb pellets and noticed there was a big waste of excess air from stock hammer spring and after tinkering with a shorter spring and spacers I noticed an externally adjustable spring would come in handy. With the parts I had at hand I could be a bit too fast or a bit too low. So today came up with this.
The thing with the stock cooking system was that sometimes because of the shorter spring during cooking the spring would fight to step on its intended seat hence why the integrated spring guide.
The system works like this.
It is externally adjustable and by using a short spring it slingshots into the valve extremely increasing efficiency. 30 shots at 17fpe or 24joule.
Initial testing suggests extreme spread of 5fps and sd of 2 over 9shots.
It has 9mm travel and can be increased by the use of spacers if needed. Only need to take stock out to change springs/spacers.
For a 200e pcp with this kind of out of the box accuracy with pellets that rival my fx crown it certainly deserved it. No barrel work has yet been made and it shoots acceptably well 10gr slugs also. Can't wait to push this to 150~200meters this weekend. Best bang for buck lightweight pcp I tried so far.
The thing with the stock cooking system was that sometimes because of the shorter spring during cooking the spring would fight to step on its intended seat hence why the integrated spring guide.
The system works like this.
It is externally adjustable and by using a short spring it slingshots into the valve extremely increasing efficiency. 30 shots at 17fpe or 24joule.
Initial testing suggests extreme spread of 5fps and sd of 2 over 9shots.
It has 9mm travel and can be increased by the use of spacers if needed. Only need to take stock out to change springs/spacers.
For a 200e pcp with this kind of out of the box accuracy with pellets that rival my fx crown it certainly deserved it. No barrel work has yet been made and it shoots acceptably well 10gr slugs also. Can't wait to push this to 150~200meters this weekend. Best bang for buck lightweight pcp I tried so far.
