What caliber AR Upper do you have?

[avking]

I have three identical AR-15 lowers and two identical AR-10 lowers. I keep them identical so I can interchange spare parts.

For uppers, I have the following:

.223 Wylde (sp?), 16" barrel
.223 Match, 20" barrel
.308/7.62, 24" barrel
.308/762, 18" barrel
.458 SOCOM, 16" barrel
.338 Federal, 22" barrel
.204 Ruger, 22" barrel
.450 Bushmaster (On the way from Bushmaster)

My favorite is my AR-30 in .300 Winchester Magnum and I want to add the .300 Lapua to it.

My most unique, by far, is the PSE TAC-15 Crossbow upper for the AR-15. It is not the best crossbow I have ever fired, but it sure is the most unique.

I want to get a 6.5 Grendel and .50 Beuwolf, but I am going to wait and see if the ammo for them even loosens up. I can't even find halfway decent brass prices for either of them.

What do you have and what is your favorite.

[avking]

Oh, I also want to add a 7.62x39 upper, so I can make use of all that SKS ammo I have been buying for twenty years. Back when it was $2 to $3 a box, I would buy all could carry everytime I went to the gun store.

[slowz1k]

Wow! That's quite a list! Congrats on all of your acquisitions thus far.

I have only one chambered in 5.56 chromed 1x7...... I do lust after the .50 Beowulf though... Maybe someday.:(

[avking]

I do not know if it is still going, but Bushmaster was selling the .450 upper for about $200 off the normal price. Only on the Bushmaster web site. Ammo is easier to get for the .450 than any other caliber, besides .223/5.56.

[Awesome]

Will the 308 uppers work with the 556 lower? I;ve heard that the magazine wells aren;t big enough to fit the 308 mags?
Do you need a special lower to work with the bigger cals?

[avking]

Will the 308 uppers work with the 556 lower? I;ve heard that the magazine wells aren;t big enough to fit the 308 mags?
Do you need a special lower to work with the bigger cals?

The .308 upper requires an AR-10 style lower. The two most common are Armalite and DPMS. Unlike the AR-15 platform, the AR-10 platform is not standardized. An Armalite compatible upper must be used on a Armalite compatible lower. Same goes for DPMS.

An AR-10 lower uses the same lower parts kit as an AR-15, with the exception of the takedown pin and buffer system. DPMS sells a AR-10 lower parts kit with the correct pin, for $80. Average price for a stripped lower is $400 for a DPMS compatible lower. Uppers right now, are running $600 for a carbine base model to $1,000 for a nice 24" barrel rifle upper.

I loved the .308 on an AR platform. It can do anything the AR-15 can do and so much more. Ammo is not considerably more expensive. But, the completed rifle is almost always going to be heavier than an AR-15.

The .338 Federal upper is also just on the AR-10 platform as is the 6.5 Creedmor, I think.

[cwconnertx]

I only have

AR-15
.223/5.56 bushmaster M4 upper (and 22LR conversion kit)
5.7x28mm SBR 11" AR57 upper (currently pistol until Fed paperwork comes back)
5.45x39mm S&W M&P15R upper

AR-10 style
308 Remingtion R25 upper on the R25 lower

I have a lot of AR 15 lowers, maybe 10 or more, some pistol, working on registering one as a SBR.

I want to get a 458 SOCOM upper, once I start reloading.
And a 6.8 SPC upper too.
I also want to get a few more 5.56 uppers and might like another 5.45x39 also

[OneBadPig]

I have no uppers......i have one complete lower and 4 stripped lowers. After i get over this cash crunch i will get a 5.45x39 upper to use with the 2100 rnds of ammo i have.

[Apocalyptic_Sojourner]

The DPMS LR-308 AP4 is the shit. To me, anyway. I know the DPMS SASS is much more accurate rifle, but it's also heavier and costs a lot more too.

[Red]

All of my AR-15s are 5.56. I've thought about playing around a little with different calibers, but haven't. I try to keep my caliber variety to a minimum. I am typically a .45 (1911) and .308 (M1A 7.62 Nato) guy but after getting my first AR a while back I've come to really like the platform, so I added it and the Mini-14 to the mix I really like all the stuff you can get for them and putting them (ARs) together myself is fun. Does anyone have any suggestions instructions for putting the upper together? I got one of those VietNam era M-16 parts kits from Sportsmen's Guide a while back ... it came with everything except the lower receiver and the trigger hook (not sure of the real name for this part). Anyway, it came to me in individualy parts... all of them new or like new. Now I need to figure out how to mount the barrel and gas tube and all rest of the upper stuff.

Have fun with all your calibers!

[hemichuck]

I currently have quite a few lowers in different brands and I have uppers in these cal.
of course 223,.556,7.62x39,5.45x39,.22, 50 Beowulf,and 450 Bushmaster. I think thats all right now.

[B-Mac]

What Grain

Wow! That's quite a list! Congrats on all of your acquisitions thus far.

I have only one chambered in 5.56 chromed 1x7...... I do lust after the .50 Beowulf though... Maybe someday.:(

What Grain Ammo are you useing with the 1x7? I have the same thing and am having a hard time zeroing in over 50 yards. Would love any help you can give.

[slowz1k]

Hey B-Mac,

Mine seems really partial to the Prvi Partisan 69 grain BTHP's. I have some 75gr also, but I haven't had a chance to really focus on putting some groups down with them. It's fairly accurate with anything that I put through it though. Most of my range time is 100 yards and less standing, kneeling, and prone. I'm not all that fond of the bench though I do recomend it when finding the 0.

BTW... I get the PPU from ammunitiontogo.com It's cheap and clean

[B-Mac]

I talked to a few snipers in the military and was told that if I am useing a 1x7 for the 5.56, then I need to be fireing a heavy grain. somewhere between 75 and 100 grain if I am going to be shooting over 50 yards because the ammo will over stabilize and start to tumble. that explains why the 55 grain ammo I bought will not zero. I am also thinking about buying a DPMS 7.62x39mm 16" A3 Complete Upper. Do you know if this upper will work with my plum crazy. at the moment I have the 5.56 on it and would love to switch them out from time to time.

[slowz1k]

I talked to a few snipers in the military and was told that if I am useing a 1x7 for the 5.56, then I need to be fireing a heavy grain. somewhere between 75 and 100 grain if I am going to be shooting over 50 yards because the ammo will over stabilize and start to tumble. that explains why the 55 grain ammo I bought will not zero. I am also thinking about buying a DPMS 7.62x39mm 16" A3 Complete Upper. Do you know if this upper will work with my plum crazy. at the moment I have the 5.56 on it and would love to switch them out from time to time.

Good question... Honestly, I don't know. I've got a stripped lower that I plan to use to build a 6.8... My build will only require a 6.8 upper and 6.8 mags... I've never researched a 7.62x39 though I know they're out there.
If you get it to work, I would recommend that you use the best 7.62 ammunition you can find. Unless you're getting a piston driven upper, the cheaper brands, and surplus ammunition that is common with that round may require a bit more maintenance and cleaning with the standard AR's direct impingement. Of course I'm only speculating, but the wolf and barnaul in 5.56 is a mess to clean up after in my rifle. There are a few more guys on this board that may shed a more educated light on this subject.... Bayou Blaster has forgotten more about most firearms than I can ever hope to know. He might chime in if he sees this post.

Let me know how it works out... You got me thinking