first off a bush pig is an ugly sheilah form neighbouring township
a short rifle is a carbine.
carbines have always and will always be used where a shorter and sometimes lighter rifle is easier on user...eg in thick bush or on horseback in scabbard.
shorter barrel will/can/sometimes reduce velocity as powder hasnt for want of a better explanation got as long of rail to launch projectile off before it exits....the plunger of syringe dont work if its not in a tube.
back before suppressors a short barrel was a flame thrower with hot loads and plurry noisy,both for reason above,the explosion is still going off outside barrel
my mighty poohseventy came from factory in 80s at 21" she was a beast for flamethrowing and my hearing isnt the best from years of using it....it also used to leave "lovebites" on my shoulder after a few rounds (bad shooting form wouldnt have helped) now it is suppressed she is a pussycat to shoot,my ears dont ring and I dont get bruising.
downside is she a little bit longer when pushing through scrub...BUT I can take can off in really thick stuff knowing POI will still be withing 3" of normal at 100 yards.for a single shot in bush its no big deal......but now I find I leave it on and just go slower which probably has helped my kill rate somewhat as a bonus,slower = quieter and more observant.
all my rifles are now suppressed,only the elcheapho 7.62x39mm was shortened to do so,yes that rifle is a wonder to carry in tight bush because of it BUT as its only ever a short range weapon the velocity decrease isnt an issue.....my other rifles get the nod if Im in open country everytime.
so pros quieter,less recoil,more pleasant to shoot,you still have mates
cons $$$$$$$$$ little bit longer,$$$$$$$balance of rifle more forwards,$$$$$$$to start with you think of boy racers exhaust,$$$$$$$you shoot more ammo because its fun again$$$$
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