Thanks all for some great information. I am good to go...

most jamming issues with an AR are magazine related, try switching mags. every round chambered in an AR will show a slight ding on the primer due to the floating firing pin.

that ammo should run both guns fine

the 223 rem case and the 5.56 nato case are the same outside dimensions

the difference between 223 rem , 223 wylde and 5.56 is the lead into the rifling the throat

223 rem is the smallest intended for 40 to 60gr bullets under clean conditions

223 wylde is a middle it will accept nato ammo but leaves out the excess space for combat conditions

5.56 will take longer heavier bullets and has combat tolerances in the throat


AR-15 BCG like to run wet it is a pneumatic piston inside the bolt there are little holes you can see with the bolt forward and the dust cover down , these get a few drops of oil

if you take out the bolt carrier group and spray it down with a penetrating oil like aero kroil or CLP or dextron automatic transmission fluid , or most any gun oil (avoiding WD-40 it works but guns up in a few months )
CLP was the standard for the Army for a long time

get it alL oiled up work the bolt in and out several times make sure the cam pin is lubed get some oil in the little holes in the side of the bolt carrier group

it is a good idea to take your BCG appart and clean everything if your having issues

rememebr there is only one thing that is not done in a strait line in the Corps , that is the 3 gas rings must not line up , this means the gap of the first gas ring needs to be opposite the second and the 3rd not line line with either first or second by 90 degrees or so

make sure your bolt lugs ar clean and make sure the recess in the barrel extension for the bolt lugs is clean and lightly oiled excess wiped off

wipe off the excess with a rag , put your gun back together with the BCG locked back put in the mag with just 1 round in it (at range pointed down range) hit bolt release let that BCG slam forward try firing that round , did it lock back on the empty mag

now 2 rounds in mag , let the BCG slam forward fire , did it pick up the second round and load it , did it lock back after second round ? if it was good load 5

fire 5 did it feed all well and lock back

keep going

if you have issues mark that mag and try a different , if the issue doesn't happen with the new mag and does with the marked mag , smash the marked mag flat with a hammer so it never gets in your gun again.

really mark all you mags with a number or letter or something that way if one has issues you can remember that one and if it has issues twice discard it

if you have 50 mags pull out some to use and store the rest if you need more than 10 mags per gun your in deep and you need help

loading mags full has caused many people issues , I load to 25 most of the time , but 28 is also fine

223/5.56 are opposite 308win/7.62x51 nato

5.56 is the higher pressure round with heavier bullets possible

and

308 win is the higher pressure round with heavier bullets possible

they Spanish rifles can't take a 308 win but all 308win rifles can take 7.62x51

blue arrow points to gas rings
red arrows point to where the carbon builds up , that radius is the same as the case mouth of the cartridge so it makes a good scraper

when we talk about wet , this area with the arrows is where the few drops of oil need to be , the rest just needs enough lube to operate smoothly not excess

the firing pin dry lube or hoppes #9 only or something similar a very light lube wiped off (so if it gets cold it doesn't freeze in place in the lube or get slowed down by sticky or excess lube)

the blue rectangle is the cam pin it is held in place by the firing pin this does most of the turning besides the bolt it's self and the firing pin is held by the cotter pin red circle , have a few of these as spares they can be a bugger to get a reused one back in and the are like not expensive https://www.midwayusa.com/product/1019428150?pid=492899

some sight options https://www.midwayusa.com/rifle-sights/br?filters=4294926540&cid=23863

The 223 wylde is a generously cut 223 chamber with a longer leade designed to fire heavy for caliber bullets (80 gr. +) in the AR 15 loaded to longer than mag length and fired as a single shot

isn't that about what I said , bigger than 223rem but not as generous as 5.56 but safely fires all the 5..56

technically wylde is a bit larger in some places than 5.56 but the main difference is 5.56 has a .2265 free bore while the wylde is a .2242

here are side by side chamber drawings https://www.pewpewtactical.com/223-vs-556/

yes the 223 wylde will take the heavy long bullets and operate saely with 5.56 and 223 rem

I appreciate the info and picture PETE. I learned a lot more from this whole thread than i did bouncing around the interweb.