I recently had the airgun bug bite me again, I own a couple of PCPs CZ 200, BAM B50, Hammerli 480K, and a Gamo Dynamaic. Among all these airguns because all these years sitting in the closet not being used only CZ 200 and the Hammerli holds air. So I decided before I fix the BAM B-50 and the Gamo (BSA) I need a newer rifle in the same price range of the Gamo in .22.Technology surely advanced a lot in the past 8-9 years. I was a little skeptical about buying the Turkish made Kral but the price was right and seems like it will deliver the power level that I am after also it's compact size was really attractive.After some tinkering with the hammer spring I got this Kral settled in the 23-24 FPE range with 15.89 JSBs and very accurate!Here's the chrony number of 26 shots starting with a little over 200 bar fill and ended at 160 bar if I kept on going it will still stay in the 810s range for more shots.812.5 200+816.1 812 821.1 200820 826.8 823.8 825.2 830.1 830 825.7 830.4 827 823.9 180824.3 825.7 823.2 822.6 820.3 824.8 827.4 820 816.7 818.9 812.9 818.2 160FPE 23.9 Extreme spread18.4 FPS Average822 FPSS.d.5.3 FPSReally happy with the result! Seems like Kral did a really good job on the valving.With butt stock collapsed and LDC attached. this carbine is about the same length of my crosman 1377 carbine It'll be a perfect squirrel hunting setup in the woods!
The Kral NP-XX seems to be much much better than the 12 year old Benjamin Prod (no surprise there).I own the Benjamin Prod and for the $400 that Crosman wants I can easily say you should buy the Kral not the Benjamin.For Crosman the lack of performance is apparently made up by the 5 year warranty Good luck Crosman with your strategy but if your air gun does not perform it will go back to you very quickly.
Thanks I bought a refurbished one from Pyramid Air It was $339 with shipping.Gun came with broken mags (still waiting on the replacement mags) and someone has tempered with the hammer spring already.It was shooting 936 fps when I got it and it was really inconsistent. So I made a delrin spring guide/ spacer and used my own way to setup a dual spring system.It's a stronger spring in the front and in between the second spring the guide/spacer sits on the guide of the end cap between the spacer and the end cap I put a softer shorter spring as a hammer bounce damper.I use to tune crosman pcps and pumpers myself and found this setup worked really well in terms of efficiency on unregulated guns.
The Kral NP-XX seems to be much much better than the 12 year old Benjamin Prod (no surprise there).
Here's a drawing of my hammer spring setup. Prototype was crudely made on the drill press and with a dremel but it worked I have a friend just purchased a 3D printer so next one will be 3D printed.
Quote from: Timmah on December 04, 2021, 11:57:59 AMHere's a drawing of my hammer spring setup. Prototype was crudely made on the drill press and with a dremel but it worked I have a friend just purchased a 3D printer so next one will be 3D printed.That was NOT what I was expecting! I was thinking spring inside of spring. Thx for posting the picture
Quote from: FuzzyGrub on December 04, 2021, 07:21:24 PMQuote from: Timmah on December 04, 2021, 11:57:59 AMHere's a drawing of my hammer spring setup. Prototype was crudely made on the drill press and with a dremel but it worked I have a friend just purchased a 3D printer so next one will be 3D printed.That was NOT what I was expecting! I was thinking spring inside of spring. Thx for posting the picture My setup is not a hammer de-bouncing setup it's more like a bounce damping setup I had a similar setup on a custom disco with 16" air tube it will do almost 25 to 30 11 fpe shots at a 1800 psi fill. My friend has the disco now and that's the only gun he will use a hand pump to fill
USAFANG6799 what air tube did you use?