Tweet
I recently purchased an M&P Shield in .40 S&W (CA Compliant) and I read that you can drop in a 9mm barrel into the .40 S&W and shoot 9mm through it because the barrel dimensions are all the same. However, I think the CA Compliant Shield barrels might be slightly different because of the loaded chamber indicator. I'm interested in buying the conversion barrel for this gun but I'm worried that the CA Compliant barrel might be different that a regular Shield barrel. Does anyone know of anything or even know what I'm talking about?
-
-
I don't think so - not because of the barrel at all - a .40 has a much larger rim dimension than a 9mm, so you might be able to feed, but you'll never extract.
The swap barrels you probably read about are the .40 to the .357 sig (which uses a .40 as the parent case).sigpic NRA Life Since 1986
LTC: 
-
I don't know about the Shield, but many people have bought 9mm barrels and magazines for their full size M&P40s and used them without issues.
If you're worried about the LCI on the Shield, just buy the replacement part from Midway or Brownells and change it out. I did my friends this past Saturday in about 2 minutes. 3/32 punch and brass hammer. Done.
RyanThe following statement is true.
The preceding statement was false.Comment
-
-
I know that it can be done with the regular Shield, but my question is if the CA Compliant Shield that has the pop up loaded chamber indicator runs into the barrel tabs, will it work with a regular Shield barrel? I have attached photos of the regular Shield and the CA compliant Shield.Last edited by -Josh-; 02-17-2016, 12:40 PM.Comment
-
Hes talking about the no profile LCI. You remove the CA compliant shark fin and replace it with this part. Basically a blank to fill the void where the fin was before. It's literally a 1 min process.
Last edited by TruEdge; 02-17-2016, 12:48 PM.The laws that forbid the carrying of arms are laws of such a nature. They disarm only those who are neither inclined nor determined to commit crimes.... Such laws make things worse for the assaulted and better for the assailants; they serve rather to encourage than to prevent homicides, for an unarmed man may be attacked with greater confidence than an armed man." - Thomas Jefferson (quoting 18th century criminologist Cesare Beccaria)"Comment
-
I see what your saying now OP. Not sure how a complaint barrel would fit in a CA version. I would think the LCI would interfere. I would try to find a CA compliant barrel just to be safe.Last edited by TruEdge; 02-17-2016, 12:54 PM.The laws that forbid the carrying of arms are laws of such a nature. They disarm only those who are neither inclined nor determined to commit crimes.... Such laws make things worse for the assaulted and better for the assailants; they serve rather to encourage than to prevent homicides, for an unarmed man may be attacked with greater confidence than an armed man." - Thomas Jefferson (quoting 18th century criminologist Cesare Beccaria)"Comment
-
The no-profile with 9mm should probably work.Comment
-
Yea but even the no profile would stick out like the regular shark fin possibly interfering with the way the non CA compliant barrel cut is. Looking at the pictures I dont think it would jive.The laws that forbid the carrying of arms are laws of such a nature. They disarm only those who are neither inclined nor determined to commit crimes.... Such laws make things worse for the assaulted and better for the assailants; they serve rather to encourage than to prevent homicides, for an unarmed man may be attacked with greater confidence than an armed man." - Thomas Jefferson (quoting 18th century criminologist Cesare Beccaria)"Comment
-
Just sell the gun(for a loss probably) and buy a 9mm shield, like you should have in the first place.Comment
-
The laws that forbid the carrying of arms are laws of such a nature. They disarm only those who are neither inclined nor determined to commit crimes.... Such laws make things worse for the assaulted and better for the assailants; they serve rather to encourage than to prevent homicides, for an unarmed man may be attacked with greater confidence than an armed man." - Thomas Jefferson (quoting 18th century criminologist Cesare Beccaria)"Comment
-
The laws that forbid the carrying of arms are laws of such a nature. They disarm only those who are neither inclined nor determined to commit crimes.... Such laws make things worse for the assaulted and better for the assailants; they serve rather to encourage than to prevent homicides, for an unarmed man may be attacked with greater confidence than an armed man." - Thomas Jefferson (quoting 18th century criminologist Cesare Beccaria)"Comment
There are currently 11966 users online. 75 members and 11891 guests.
Most users ever online was 239,041 at 10:39 PM on 02-14-2026.
Comment