Building an AR-9 results in a weapon that is extremely fun to shoot.
Very reliable and practical for various uses. And fairly cheap to shoot.
But, like all else, they need to be fed. This is the focus of this topic.
Basically there are three ways to do this. And all are good options.
You just need to decide which is best for you and your build.
First method is a dedicated lower receiver. This is the more pricey way.
Usually these lowers take either Glock or Colt style magazines.
There are other variations like the Quarter Circle 10 S226 that I have.
It allows me to feed my AR-9 pistol with Sig P226 mags.
The next two methods allow the use of standard lower receivers.
Second method is using adapter blocks. Priced between $60-100.
These are blocks that attach inside the magwell of the lower.
They allow the use of various 9MM pistol magazines.
I have no personal experience with these.
Third method is altering standard mags to feed 9MM cartridges.
This is the cheapest method of the three, to an extent.
It depends on the number of mags you choose to alter.
I recently built 3 PMags with Endomag inserts for my carbine.
I think I paid $75 for the inserts and uses mags that I already had.
With limited testing, these mags have been flawless so far.
Which ever method you choose, you will need mags.
So the cost of the mags should also be a consideration.
Something to keep in mind when buying a BCG for your build.
Some are designed to use either Glock or Colt style mags.
And some are designed to use both.
Thanks for reading. Have a great time. Be safe.