Modern .30 Carbine?

[carbine85]

How about a M4 type stock with rails on the front, a threaded barrel for a flash hider and a rail hand guard. You can apply any finish you want these days.

 

[FMJMIKE]

How about a HK MP-5 in .30 Carbine..............

 

[Maverick223]

Mike, the mag well is WAY too small in a MP5.