i have shot my blue streak stock since 1978. last year, after about 5000 full power (eight pumps) shots the seal started leaking. i sent it to mac 1 airguns. and got the steroid tune! wow! almost 900 fps, good trigger, great accuracy, hits squirrels like a .22 rimfire, over the years i tried a few scope mounts, i didn,t like them so i went to a williams peep sight. it shoots half inch groups at 50 yards!
i paid about $150. for the tune and the peep sight. for the money it has to be a deal for such performance.
i also own a fwb 124 and hw 77, both very fine german springers. but the blue streak shoots .20 cal pellets faster than they shoot .177s. i love mine!
you could duplicate mine for about $300 bucks including, new gun, steroid tune, williams peep sight....i,m not sure what else you can buy that shoots 900fps into half inch groups for $300?
good luck!
coopershooter