JD Lud Posted January 24, 2020 Share Posted January 24, 2020 Most of my AR shooting has been in the military with a few varmint rigs in the past. A while ago on a whim I bought an AAC MPW carbine in 300 Blackout. I shot maybe 30 rounds in it, just enough to site in a red dot with some handloads. Anyways, I was cleaning the other day and found this, not running suppressed so really no use in keeping it and thinking about getting a different upper for it. A few questions as again I have only bought full rifles (or recently a Saint pistol). If I take off the 300 upper and get a 223 Wylde upper, I can remove the BCG and CH from the 300 upper and utilize with any other upper assembly for 223/5.56 as plug and play, correct? Should be no need to adjust anything as barrel and receiver should be already done? The only thing I may need to do is adjust buffer weight, spring, or gas if cycling issues... The AAC MPW has a Geissle trigger in it and some nice features, and the bolt is a pretty high end one as well so no need to buy an upper with them if I don't have to. Here are a couple I was looking at for a spring P-dog trip and just general paper whenever time allows. Im leading toward the Palmetto build with FN barrel and the wylde chamber but curious on your thoughts. I have a few 16" ARs laying around in the box so not looking for mil spec, just a bit more velocity and some better accuracy. Thanks, and as always any suggestions fire away.... https://bravocompanyusa.com/bcm-ss410-18-rifle-upper-receiver-group-w-mcmr-15-handguard-1-8-twist/#product-reviews https://palmettostatearmory.com/psa-18-chf-rifle-length-223-wylde-1-8-15-geissele-mk14-m-lok-upper-no-bcg-or-ch.html Link to comment Share on other sites More sharing options...
Tyrel Cody Posted January 24, 2020 Share Posted January 24, 2020 Yes, you can share the BCG between 300blk and 223 wylde/223/556 Link to comment Share on other sites More sharing options...
Michigan Slim Posted January 25, 2020 Share Posted January 25, 2020 I'm thinking your buffer should be OK too. Should be plug and play. I've done business with Palmetto in the past and they are very helpful. It sounds like your doing fine though. Link to comment Share on other sites More sharing options...
Perro Del Diablo Posted January 25, 2020 Share Posted January 25, 2020 Barrel is difference with.224 or .308 other than that 300 black out is a cut short and necked up 223. The Wylde has a shoulder angle in between 556 and 223. Link to comment Share on other sites More sharing options...
Sixgun Sheridan Posted January 25, 2020 Share Posted January 25, 2020 Theoretically only the barrel and flash hider is different between a .300 Blackout AR and an equivalent in .223. In practice some conversions might need a little tweaking of the gas system, buffer, and/or magazines for maximum reliability. In a perfect world however you should only need to swap barreled uppers to change calibers. Link to comment Share on other sites More sharing options...
JD Lud Posted January 25, 2020 Author Share Posted January 25, 2020 Thanks all, appreciate you reviewing my thinking and confirming all good. any brand preference between the two or others? Looking to stay 1/8 for some medium weight bullets. thanks! Link to comment Share on other sites More sharing options...
Michigan Slim Posted January 25, 2020 Share Posted January 25, 2020 I've only used Palmetto for my builds so I can't help with Bravo. Link to comment Share on other sites More sharing options...
Chili Ron Posted January 25, 2020 Share Posted January 25, 2020 Howdy, You might look up R Guns and give them a call during normal budnizz hours. Ive dealt with them as they took in cowboy style guns and priced em right. Best CR Link to comment Share on other sites More sharing options...
Muleshoe Bill SASS #67022 Posted January 25, 2020 Share Posted January 25, 2020 Push out pins and pull 300BO upper and slap in the 223 upper. You can use BCG for both. Link to comment Share on other sites More sharing options...
JD Lud Posted January 25, 2020 Author Share Posted January 25, 2020 Thanks all. I went ahead and ordered the Bravo Company 18" 410 stainless one. Primary Arms had it in stock, and they are gracious enough to give a 10% discount to military...filled out the form late last night and they emailed me approval this morning so the service seems to be there as well. Appreciate the help! Link to comment Share on other sites More sharing options...
J.D. Daily Posted January 25, 2020 Share Posted January 25, 2020 If you are shooting subsonic I suggest you buy 300BO mags. The bullet shape of the 190-240 grain bullets likely will not feed reliably from 223/5.56 mags. It isn't an issue for supersonic ammo. Link to comment Share on other sites More sharing options...
Still hand Bill Posted January 25, 2020 Share Posted January 25, 2020 Also watch which ammo goes into which upper. 300bo will chamber in a 223, but does bad things when it goes boom. It will fire, but it destroys the upper. If interested do a search and you can see what happens. Link to comment Share on other sites More sharing options...
JD Lud Posted January 25, 2020 Author Share Posted January 25, 2020 Im going to get rid of all 300 blackout stuff, so no confusion as I don't have any other rifles. I plan to sell the upper, dies, bullets, and ammo that's left so no chance for confusion. I would have never thought the 300 would chamber in a 223....doesnt seem logical but it makes me want to try it I could see a 223 chambering in the 300.... Link to comment Share on other sites More sharing options...
Still hand Bill Posted January 26, 2020 Share Posted January 26, 2020 It seems very counter intuitive that a 300 black out will chamber in the smaller diameter 223 chamber. Turns out that the larger bullet is far enough back that it clears the shoulder in the 223 round. Might be hard to close, but it will close. I was surprised that you can fire it and the bullet will go down the barrel. This is one of those cases Where I can learn from others mistakes. the other way around isn’t an issue as the 223 bullet will easily make it out the barrel. Won’t have any accuracy, but it won’t do any damage either. Link to comment Share on other sites More sharing options...
Muleshoe Bill SASS #67022 Posted January 26, 2020 Share Posted January 26, 2020 You can buy band markers to place on handguard to identify the 300BO upper, Link to comment Share on other sites More sharing options...
Tyrel Cody Posted January 26, 2020 Share Posted January 26, 2020 21 hours ago, JD Lud said: Im going to get rid of all 300 blackout stuff, so no confusion as I don't have any other rifles. I plan to sell the upper, dies, bullets, and ammo that's left so no chance for confusion. I would have never thought the 300 would chamber in a 223....doesnt seem logical but it makes me want to try it I could see a 223 chambering in the 300.... I keep separate magazines clearly marked for both calibers and as already mentioned you can mark your uppers as well to avoid confusion; the easiest way is laser engraved ejection port covers. Your choice of course but I think it's a fairly small risk if you take appropriate precautions. Link to comment Share on other sites More sharing options...
Dantankerous Posted January 26, 2020 Share Posted January 26, 2020 23 hours ago, J.D. Daily said: If you are shooting subsonic I suggest you buy 300BO mags. The bullet shape of the 190-240 grain bullets likely will not feed reliably from 223/5.56 mags. It isn't an issue for supersonic ammo. This. Originally we were told that 5.56 and 300 Blackout could use the same magazine. Well, almost. In many cases it will work fine but I have discovered especially with Magpul magazines (who do now make a dedicated 300 Blackout magazine) they tend to run more reliably with the 300 Blackout ammo. Especially the heavier bullets. In my experience a brand new magazine works fine but as the magazine cycles over and over and over and perhaps the spring gets a little weaker or just gets a little more flex to it there can be a problem with 300 Blackout heavy bullets feeding reliably out of a 5.56 magazine. Link to comment Share on other sites More sharing options...
Dude Slade Posted January 27, 2020 Share Posted January 27, 2020 On 1/26/2020 at 9:17 AM, Still hand Bill said: It seems very counter intuitive that a 300 black out will chamber in the smaller diameter 223 chamber. Turns out that the larger bullet is far enough back that it clears the shoulder in the 223 round. Might be hard to close, but it will close. I was surprised that you can fire it and the bullet will go down the barrel. This is one of those cases Where I can learn from others mistakes. the other way around isn’t an issue as the 223 bullet will easily make it out the barrel. Won’t have any accuracy, but it won’t do any damage either. You can NOT fire it safely, and the bullet will NOT go down the barrel; the upper will explode. There are tons of pictures and stories about this out there. You MUST be extremely careful to not chamber .300BO in a 5.56. 300boina556.webp fired300ina556.webp Link to comment Share on other sites More sharing options...
JD Lud Posted February 1, 2020 Author Share Posted February 1, 2020 Here is the new upper installed....I have a VXR patrol laying around with TMR reticle I might throw on it...perhaps a mount with a rail on the ring to stack a reflex too. trijicon accupower 1-8 looks interesting.. Link to comment Share on other sites More sharing options...
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