A .33 Trapper...that's interesting!!
Never would have imagined they made them, even special order.
I've had 4-5 .33s over the yrs, all with standard 24" barrels, never even seen a 20" carbine.
I've had a number of variances, the last one I sold was a shotgun butt, 1/2 mag T/D in 95+ condition.
The one I kept is a crescent butt, full mag, solid frame in about 70%.
I like .33s & was fortunate enough to stock a small supply of reloading components for it.
Sure would be nice to see a pic of above gun.
