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223 AICS Mag for max COAL?

swhiteh3

Sergeant
Full Member
Minuteman
Aug 19, 2013
267
68
North of Charlotte, NC
The AI AICS magazines I have will hold about 2.550", and from my search, the other AICS-compatible magazines I can find range from 2.325" to 2.550" max length. Are there any .223 magazines that fit into an AICS-compatible chassis that are longer? I'm trying to load 85.5gr Bergers, and putting them at max mag length (2.550") put the bearing surface right at or a bit below the neck shoulder junction, which I usually try to avoid. I'd like to be at 2.600".
 
I think an Accurate mag is AICS compatible. I have a 223 built on a Remington action with a 1:7 twist barrel. I am using Accurate mags. The follower can easily be trimmed to allow for longer COAL. I'm shooting Berger 80.5 FBT, but I do have a box of 85.5 that I am going to try.

The Accrurate website shows max OAL of 2.325" but I know you can easily go past that with the follower trimmed. If you want a picture of my mag send me a pm and I'll send you a picture of my mag with the trimmed follower.

 
Accurate mag is the ticket , but beware they get finicky to feed after 2.550 , they tend to spear the tennon, try them at mag length and see how they shoot , I also like them seated above the neck shoulder junction, but sometimes it works just fine to be a bit deeper.
 
The AI AICS magazines I have will hold about 2.550", and from my search, the other AICS-compatible magazines I can find range from 2.325" to 2.550" max length. Are there any .223 magazines that fit into an AICS-compatible chassis that are longer? I'm trying to load 85.5gr Bergers, and putting them at max mag length (2.550") put the bearing surface right at or a bit below the neck shoulder junction, which I usually try to avoid. I'd like to be at 2.600".
https://www.snipershide.com/shooting/threads/accurate-223-mag-question.6987588/#post-8318692

This thread has some good info. As I said in it, I was able to dremel out my Accurate mag to about 2.600" or a little shy. Someone below me posted a video on removing material from the back to get 2.630".

 
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First, my apologies for resurrecting this thread, I couldn't find the answer otherwise. The polymer MDT mags state a coal of 2.55, is this the longest known to date?
 
The rifle came with an Accurate mag. I milled the insert today and just cycled 6 rounds without a hiccup. These are seated at 2.445 which is kissing the lands. I think I'll get another Accurate mag and be done.
 
I have a few MDTs and one modified for coal Accurate Mag feeding a T3 in a MDT ACC.
The MDT is lighter, fits the chassis with a little less slop.
I can't tell much difference between the two stripping the first round off a full stack.
Both have been reliable.
Tossing a single round into the port ( completing a stage after whatever miscue leaves you short), the Accurate Mag will allow it to chamber about 70% of the time, the MDT doesn't allow for this at all. Action architecture and cartridge COAL plays a major role here I suspect.
If one is hoping to get away from the horribleness that is filing plastic for fine tuning (w the Accurate), you're not. It has a polymer filler inside the metal lips.
MDT has about 1/2" less height.
 
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