- Messages
- 159
I'm a fan of just running a standard lower with a colt mag adapter since it maintains all the functions of a standard ar15. I'm not sure what is or isn't allowed for IDPA though.
By clicking Enter, you confirm you are 18 years of age or older and agree to comply with all applicable local, state, and federal laws.
Notice: Any content or member activity - including anything you may buy, sell, transfer, or discuss - must comply with current and upcoming laws.
Members are encouraged to stay informed: California Firearm Laws: 2026 Outlook & 2025 Recap . Responsibility for compliance rests solely with the individual member.
Welcome to CAguns.net!
Join our growing community where you can ask questions, share knowledge, or browse our classifieds section.
Sign up for a free account today and unlock full access! Once registered, you can search, post, and take advantage of exclusive features unavailable to guests.
A note on why more of the site now requires an account: automated scrapers and AI systems have been crawling our forums and classifieds at a scale. Requiring sign-in for those sections is the most effective tool we have. It takes a minute to register, it's free, and it keeps what happens here between actual members.
New to California gun ownership or trying to keep up with the changing laws? Check out our sister site CA2A.com — free courses, plain-English legal updates, and step-by-step guides built for California owners.
Advanced features are available only to registered members. Register today!
I'm a fan of just running a standard lower with a colt mag adapter since it maintains all the functions of a standard ar15. I'm not sure what is or isn't allowed for IDPA though.
Real colt mag adapters are a pair of blocks that you install into a 5.56 lower by cross drilling and inserting roll pins to hold the blocks into the magwell.fair enough, haven't tried colt mag adapters so don't know which ones work.
Never seen those before. The mag adapters you find these days work well if you still small pockets for the internal grub screws to grab on to the mag well.Real colt mag adapters are a pair of blocks that you install into a 5.56 lower by cross drilling and inserting roll pins to hold the blocks into the magwell.
![]()
Any time you have an issue pertaining to ar9's I highly recommend browsing Blowback9's website or reaching out to him. Great dude with a ton of knowledge.I had the mag adapter (Stern) for the Colt mags and it never seemed to work quite right. It might have been my upper so I will probably get a PCC (Ruger PC, PSA, MPX, or something like that) and then get a 9mm upper with a standard lower and see if the set up might work better.
Or cz75 mags for that matter. There is a Canadian company that makes the adapter. Works great.
Try putting a internal indo mag in a 556 p mag it should work well I had the same problem using CMMG and switch to Endo with the ejector on top of internal it works fineI had the mag adapter (Stern) for the Colt mags and it never seemed to work quite right. It might have been my upper so I will probably get a PCC (Ruger PC, PSA, MPX, or something like that) and then get a 9mm upper with a standard lower and see if the set up might work better.
Juggernaut Tactical is CA friendly also.Aero EPC 9 is going to be the cheapest/most reliable/easiest to assemble in CA. You can get lowers at almost any store locally including Sportsmans warehouse. Highly recommend the Maxim RDB for a buffer with a taccom upper/bcg, they have a few different barrels but the shrouded barrels are the way to go, 16" is so long the bullet is actually slowing down by the end. I run the 10/16 which is a 10 inch barrel with a 6 inch carbon shroud with a built in muzzle brake. If you want something a bit more unique I really like the KE KP9 polymer lower. If you want to run USPSA or IDPA it has to be a "rifle" and not a pistol set up so some of your options wont work. PCSL does allow pistols if you run PCCs though. What I've listed above you can put together for under a grand.
I got one, AR pistol, shoots greatJuggernaut Tactical is CA friendly also.
Have an AR 9 PCC from them, getting the 9mm pistol soon.I got one, AR pistol, shoots great
I wanted a short barrel without it being a fire breather, and cheaper to shoot.Have an AR 9 PCC from them, getting the 9mm pistol soon.
Had a 5.56 pistol from them but want all PCC instead of rifle caliber
I’m old enough to remember seeing a few of those original 9mm Colt carbines on active duty with the pinned magwells. Though, most special units back then just ran the MP5.Real colt mag adapters are a pair of blocks that you install into a 5.56 lower by cross drilling and inserting roll pins to hold the blocks into the magwell.
![]()
Yeah, I switched everything to 9mm, pistol and carbine. Simple 12ga for the big stuff.I wanted a short barrel without it being a fire breather, and cheaper to shoot.
I have both. And both are great, different but great in their own waysIf I were looking, I’d likely be down to the Ruger PCC or the Henry PCC. The Henry has a more traditional wood and steel look that is very nice.
Welcome to CAguns.net!
Hello There! I see you're browsing as a guest. Sign up to use our regional search features and communicate with other members.
Registering is quick and free. Once registered, you’ll unlock exclusive features available only to members. Join today!
If you choose to become a contributor, you'll get even more advanced features.📸 We're now on Instagram! Follow us @caguns_net and tag us in your videos and photos to get featured!