The debate over the effectiveness of pistol caliber carbines has gone on for years. Many well known firearms experts think they are a great idea. Others state that if you’re going to use a long gun, use one in rifle caliber and stop messing around.
I understand both sides of the argument. I don’t think either answer is right for everyone....
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I guess it depends on the use. I like my Colt 6430 as it is light and handy. But the Rock River AR-9 pistol, modified with a Ballistic Advantage 8.9" barrel and free float tube (which has since been SBR'd) is shorter with a suppressor and still shoots 2" groups at 200 yards with a max load of Power Pistol and Hornady 115 gr XTPs or HAPs.
In contrast the Colt shoots 4-5" groups at 200 yards, which still isn't bad for what amounts to a personal defense weapon.
Both work well for a truck gun. The SBR with a suppressor is better for personal defense.
But for a personal defense weapon I still prefer an MP5 with a suppressor. It's suitably torso accurate out to 200 yards and consistently head shot capable at 100 yards, and suppressed and shooting sub sonic 147 gr hollow points its ear safe and quite effective in doors at social shooting distances.
A carbine in .223 can also be built to be quite light and suitably short, but they are loud, especially in enclosed spaces. Ballistics start to take a serious hit in shorter barrels so if you SBR one to keep it short with a suppressor you lose a lot in terms of terminal ballistics, especially out past 100 yards.
And of course there is nothing wrong with the M1 Carbine as a personal defense weapon, at least out doors. I did very well with one in tactical rifle matches with targets from close quarters to 250 yards, and it has been consistently under estimated since the 1980s.
I have also always liked the AR-180, and when properly configured with a folding stock, the AR-180B is excellent. it just had bad timing coming out at the same time as cheap AR-15s, and didn't do well with the tacticool pic rail crowd. In my experience the 180B is superior in nearly all respects to the original AR-180.
But when it comes to a light, portable rifle I am oddly enough a fan of the Mini-14. The pre mid 580 series take some work to accurize but when done, they will hold consistent 1.5 MOA 5 shot groups at 100 yards with Hornady 55 gr FMJs.
With Samson reviving the folding stock, it's also compact and a good truck gun choice.
Accuracy wise they are comparable to my Colt SP1 and M16A1 upper on an NDS 601 lower.