Hi;
Was interested in the M77/357 but got sticker shock. For someone looking for a carbine in pistol calibers - HiPoint makes carbines in 9mm,40 S&W and .45acp. Their mags may need a little tweeking but they are cheap,fun and mags from the carbine also can be used in the Hipoint pistols of the same caliber.
Of the 9 Hipoint pistols and carbines and the 38 mags for the weapons, I only had 1 mag that was in need of tweeking. If you left the mags set for a month or 2 loaded - the mag may "self" tweek with no problems.
Lifetime warranty on pistols and carbines.
If Hipoint would come out with a 38/357 pistol/carbine or a .45 long colt deal - I would buy them.
Hipoint had to open up a second manufacturing facility to handle the demand.