T Bill 649 Posted September 20, 2013 It's what stamped on the barrel not the lower receiver. 1 Quote Share this post Link to post Share on other sites
blksheep 466 Posted September 20, 2013 It's what stamped on the barrel not the lower receiver. Markings on the barrel is key. Quote Share this post Link to post Share on other sites
blizzzarddemon 0 Posted September 20, 2013 Hmm its from bushmaster I will have to look Sent from my DROID RAZR using Tapatalk 2 Quote Share this post Link to post Share on other sites
Spike 7.62 0 Posted February 13, 2014 For almost a decade I fired nothing but military "green tip" 5.56mm and some tracers, quite a bit actually, from the "CAL .223" AR I owned. Never once did I have an issue and when cleaning I do look at the parts. Honestly I'm not worried about it and I've never heard of an issue related to that. I have sold MANY 5.56 rounds to civi AR owners and never heard of a problem with them either. I'm not saying it's not bad for your weapon, but I will say I haven't noticed any extra wear and tear. Quote Share this post Link to post Share on other sites
raz-0 1,259 Posted February 14, 2014 I've said it before, and I'll say it again. The markings and literature mean almost nothing. Some .223 reamers are slightly more generous than some 5.56. Then you have 5.56 Sam-r, and .223 Wylde. They all overlap. Want to know, buy a box of 5.56, fire a couple and examine the brass. If it has trouble ejecting, splits the case neck, etc. don't do that anymore. Quote Share this post Link to post Share on other sites
XDJohnTact 49 Posted December 1, 2019 I have seen many articles/posts saying you can shoot 5.56 in a .223 Wilde, is this not true? Quote Share this post Link to post Share on other sites
JohnnyB 4,325 Posted December 1, 2019 Yes, you can shoot 5.56 in a .223 Wilde.....All day long! 1 Quote Share this post Link to post Share on other sites
XDJohnTact 49 Posted December 1, 2019 Thanks JohnnyB! Quote Share this post Link to post Share on other sites
0Jeep4 87 Posted December 1, 2019 Second @JohnnyB I shoot 5.56 all day out of my .223 Wylde, probably over 1,000 rounds. Never had an issue. I do find that .223 tends to be slightly more accurate out of it though. Quote Share this post Link to post Share on other sites
dino71 7 Posted February 12, 2020 On 3/27/2013 at 10:41 AM, jto966 said: I have a suggestion or question. Couldn't you just take a 5.56 bullet and see if it will fall through a .223 barrel ? Seems simple enought to me. Since it's .110 bigger - It's not going to fit and drop out the other end.. right? 5.56 mm = 0.218897637795" The 5.56 mm bullet better fall through a .223 barrel since its about 4/1000th smaller! I am not a machinist so I am not sure if that's a significant delta. I think the 0.110" is a linear (horizontal) dimension not a diameter/caliber dimension. 0.223" - 0.218897637795" = 0.00410236" Quote Share this post Link to post Share on other sites
Sota 1,191 Posted February 12, 2020 https://americanweaponscomponents.com/clearing-the-caliber-confusion-223-wylde-vs-5-56-nato Quote Share this post Link to post Share on other sites
raz-0 1,259 Posted February 12, 2020 1 hour ago, dino71 said: 5.56 mm = 0.218897637795" The 5.56 mm bullet better fall through a .223 barrel since its about 4/1000th smaller! I am not a machinist so I am not sure if that's a significant delta. I think the 0.110" is a linear (horizontal) dimension not a diameter/caliber dimension. 0.223" - 0.218897637795" = 0.00410236" No.. dear god no. Look man the diameter in a cartridge name isn't really meaningful without a spec. Some are the size at the lands, some are the size at the grooves, and some are the bullet diameter that gets smashed down somewhat in the shooitng and may not actually really match either the lands or grooves. Some are just a convenient approximation of the above. Ignore the name unless buying boxed ammo, and read the spec. For example 9mm parabellum is 9mm right? That's 0.354331 inches. The bullets are .355 whcih is 9.01mm. The saami spec for land diameter is 8.82mm and the groove diameter is 9.02mm. So yeah. Quote Share this post Link to post Share on other sites
dino71 7 Posted February 13, 2020 23 hours ago, raz-0 said: No.. dear god no. Look man the diameter in a cartridge name isn't really meaningful without a spec. Some are the size at the lands, some are the size at the grooves, and some are the bullet diameter that gets smashed down somewhat in the shooitng and may not actually really match either the lands or grooves. Some are just a convenient approximation of the above. Ignore the name unless buying boxed ammo, and read the spec. For example 9mm parabellum is 9mm right? That's 0.354331 inches. The bullets are .355 whcih is 9.01mm. The saami spec for land diameter is 8.82mm and the groove diameter is 9.02mm. So yeah. Thanks raz-o, there should be a class somewhere to tech this you get really get in the weeds with the numbers. Do you know if there is also a ISO 90001 standard for this topic? Quote Share this post Link to post Share on other sites
Zeke 5,504 Posted February 13, 2020 25 minutes ago, dino71 said: Thanks raz-o, there should be a class somewhere to tech this you get really get in the weeds with the numbers. Do you know if there is also a ISO 90001 standard for this topic? SAAMI Quote Share this post Link to post Share on other sites
Ray Ray 3,566 Posted February 14, 2020 From God aka Paul Harrell https://youtu.be/BTgGhIcR_Mk Quote Share this post Link to post Share on other sites
marlintag 223 Posted February 26, 2021 Just a word of advice, if your shopping for an ar15 upper just save your time and money and get a 223 wylde upper. Their plentiful, generally affordable and will save you accuracy headaches with cheap 223 ammo. Quote Share this post Link to post Share on other sites
raz-0 1,259 Posted February 26, 2021 31 minutes ago, marlintag said: Just a word of advice, if your shopping for an ar15 upper just save your time and money and get a 223 wylde upper. Their plentiful, generally affordable and will save you accuracy headaches with cheap 223 ammo. yes. .223 wylde 1 in 8 rifling. This is the way. Quote Share this post Link to post Share on other sites
charleslee 44 Posted December 7, 2021 So if your AR barrel reads .223/5.56 you would assume you can use both, no? Which one is your barrel chambered for? Quote Share this post Link to post Share on other sites
EdF 323 Posted December 7, 2021 2 hours ago, charleslee said: So if your AR barrel reads .223/5.56 you would assume you can use both, no? Which one is your barrel chambered for? Yes . . . You can use both if both are listed . . . Quote Share this post Link to post Share on other sites
silverado427 10,728 Posted December 7, 2021 Barrels usually only have one caliber roll mark. Quote Share this post Link to post Share on other sites