Sub cal ar-15 question?

May 2021 4 89 Report

Sub cal ar-15 question?

I am thinking about building a standard ar-15 lower and using a 10mm upper on it. I would like to use glock 20 mags with a kriss extention, but I can't find a magwell adapter. Does anyone know where I can get an adapter for glock 20/21 mags? If i can't find one I'll probably just get a hahn grease gun adapter. For the upper, i would like to build my own, but i dont really know where to start. Can someone point me in the right direction to start building a 10mm upper? If i can't built my upper I'll probably buy an Olympic and replace the sight and forearm.

What are your thoughts?

Thanks, Ryan

Sports / Outdoor Recreation / Hunting

Glacierwolf

I am guessing the reason you dont find mag adapters for this - is because they do not make them. They do not make them because it is not practical and there is zero demand for it. Getting a gun to fire properly means more than stuffing any mag in the aproximate position........ it's not like making love in a car backseat and eventually finding out where things fit - the mag needs to align flawlessly with the barrel feed ramps so the cartridge goes into the chamber opening first time and every time.

You begin a project like this - by finding a barrel and BCG first - then asking the maker what magazines can be used. It's literally just that easy. Assuming you have the tools, training and skills to complete the work.

Now - unless you have tons of money and dont mind dropping several hundred bucks for tools you might only use once - the 'smart money' is to simply buy a complete AR upper in 10mm. This way any jams or failure to function problems become a warranty issue - and not a new headache for you to puzzle out over the next few months and years....... as you dump hundreds of more $$$ into this project rifle blindly replacing parts.

Lots and lots of people have been greatly disapointed with 9mm, 10mm and 45acp AR-15's - I highly suggest you get some trigger time on one before you buy this. It shocks me that a guy will spend 2-3 hours picking out a $20 pair of sneakers .......... but drop $700-$1100 or more on a rifle they have never fired! You buy this upper and dont like it - expect to take bath when you sell it ....... not many folks want a 10mm AR. Be lucky to get $200 for it - and - they guy who buys it will probably rip off the barrel .... toss it and the BCG out and use the rest of the parts to build another upper.

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