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What is the best configuration of bevel washers in mk1 crown with 16 mm piston ?

I have a crown mk1 shooting 21 gr ZAN slugs at 945 fps . What mods can be done shooting 24.5 slug or pellet at 945 fps . At the moment I can shoot them at 870 fps

Impact mk11 .25 , ZAN slugs 33 gr shooting @ 975 fps 110- 115 yards

Well just ordered H&N.25 slugs , should be here by Thursday if not sooner https://jsb-diabolos.de/?slugs,78

Tried JSB slugs .25 tonight out of my impact, so far results are very promising, only tried from 30 yards and out to 75 yards and slug on slug at all these ranges . Tried at 940 FPS To 975 FPS Hitting one mildot higher than JSB mk2 33.9 gr , JSB slugs weigh in at 33.5 gr . Price £7.20 per...

My .25 mk2 with power plenum fit last week , starts off at 970 FPS for about 5 shots then after drops to 958 for about 5 shots then keeps going down to 930 Reg setting 125 bar . I changed reg O ring last week any idea what it might be ?

Let the testing begin with .25 H&N slugs with more to come in different head size

With the new FX impact out , will it make the plenum kits from different makers redundant?

I have been running my .25 impact on 160-170 bar and 970 FPS , b on the dial and 3 lines on front adjuster achieving 35 shots . So I thought I would install a plenum kit from the UK, which comprises of , transfer port with two holes , valve housing which has been modified, pellet prob which has...

Just ordered 21and 23 gr .22 slugs from H&N https://jsb-diabolos.de/?5-5-22,60

What does a external plenum actually do ? Does it mean you can run the gun at a lower bar and gain more FPS?

Had a return email from JSB Hi Mitch, Many thanks for your e-mail. As for the slugs. We have been working on this project for almost a year but we haven’t been successful with the design yet. We should have another several sets of samples in about two weeks and hope some of them will...

It’s all gone quiet on the JSB slugs , anyone heard anymore on them?

What are the advantages having higher reg pressure and a heavy hammer weight , compared to other mods , like opening transfer port , prob cut away and bigger plenum? 

what would be a good reg pressure and other settings for a FX impact MK2 .25 using jsb 34 gr?

Hi , I am a newcomer to this forum and from the UK . Looks like a great forum for what we call high power air guns (FAC). I have two FAC guns , FXimpact.25 and FX crown .22, both fantastic guns .