Never heard of them alafa, I bought a 177 pellet 20 inch barrel direct from RTI , I am pretty sure its a L, W barrel, Not sure of the twist rate,, I installed it and made no change to the gun,,, I was shooting a JSB 10.3 gr pellet at 1190 and 1200 FPS I shot a whole magazine at 49 yards no flyers and a dime size group, Regulator is at 130 and I turned the spring out a couple turns to about 960 FPS,, I have a few 177 slugs but for right now I do not have the range for them, 100 + yards should be minimum for slugs...
We get 50 barrel buyers and I will decide the caliber.
Be a good reason to buy a compact, And having a slug gun better than having a pellet gun shooting slugs...
Be nice to let me know the cost in this group buy,,, PR me if you have to..
Mike