I already have a 16 " m4 I made from an 80% lower, pre ban so I can do what I want with it, and I recently came into a gas block, stripped upper, and carbine length quad rail and decided to build another upper, but I'm having trouble deciding which direction to go, I was leaning 9mm but it seems it would cost a bit more than I'd like, anyone have any suggestions ?
Ideas for a new upper assembly
- Thread starter klmo1990
- Start date
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Biggfoot44
Ultimate Member
- Aug 2, 2009
- 33,469
What, an hour 34min and nobody sugguested.300 yet ?
HordesOfKailas
Still learning
I like 300 BLK. 
The big benefit is magazine, BCG, and lower overlap with 5.56. It's great in shorter barrels, so 16" would be a bit of a waste IMO. If you got a <16" upper, you could always keep the stock off when you have the short upper on making it a pistol. This assumes is started as a pistol, but since you made it from an 80%, who's to say it didn't.
IANAL.
The big benefit is magazine, BCG, and lower overlap with 5.56. It's great in shorter barrels, so 16" would be a bit of a waste IMO. If you got a <16" upper, you could always keep the stock off when you have the short upper on making it a pistol. This assumes is started as a pistol, but since you made it from an 80%, who's to say it didn't.
IANAL.
Biggfoot44
Ultimate Member
- Aug 2, 2009
- 33,469
It doesn't do worse from a 16in, it just only has a minimal increase in velocity.
ajviera
Active Member
From left field how about Sharps 25-45? Way more knock down power than 223/556, @ 300 yds the 25-45 has 862 flbs of energy compared to the 223 494 flbs with a 20" barrel and it has way more range than 300 BLK video link shows it hitting steel @ 800 yds.
https://www.youtube.com/watch?v=Kfdm4dP6b-0
https://www.youtube.com/watch?v=Kfdm4dP6b-0
Apd09
Active Member
I'm looking into building another 5.56 but using a side reciprocating upper with bump fire stock. Just for a different look but still use same rounds and mags.
Are you interested in a different caliber or different look?
Sent from a galaxy far, far, away....
Are you interested in a different caliber or different look?
Sent from a galaxy far, far, away....
BossmanPJ
Ultimate Member
I have a 16" Blackout upper and it shoots great. No complaints. Accuracy is good.
As far as I know the .300 Blackout only needs an 8" barrel or so to shoot properly but a longer barrel doesn't hurt it.
As far as I know the .300 Blackout only needs an 8" barrel or so to shoot properly but a longer barrel doesn't hurt it.
Yeah that's my vote, 300 blklivesmatter.
No offense meant ... That was a joke.
I was shooting suppressed in the dark last night @ 1 power and the flash through the scope made me wonder if the flash would be brighter at 4X ?? Considering the consequences I did not try it. ... Yet.
No offense meant ... That was a joke.
I was shooting suppressed in the dark last night @ 1 power and the flash through the scope made me wonder if the flash would be brighter at 4X ?? Considering the consequences I did not try it. ... Yet.
ajviera
Active Member
Just a question, why not use a non reciprocating side charging upper especially if you what the high cyclic rate of a bump fire?
Apd09
Active Member
Because when you've been up since 3:30am with a sick child you write reciprocating instead of side charging.
I would not use the reciprocating on that type. Could be a real nasty bite if any part of you gets near that.
Sent from a galaxy far, far, away....
ajviera
Active Member
Fair enough. have you looked into American Spirit Arms? I have one for my 6.5 creedmoor and really like it.
http://www.americanspiritarms.com/upper-receivers/side-charger-upper-receiver-without-carrier/
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Apd09
Active Member
No but I may look into them. I was only able to find this one in my searches, I can have them cerakote as well since I'm doing and FDE build. A lot of people were out of stock on these.
https://gibbzarms.com/product/g4-enlarged-ejection-port-side-charging-upper-receiver/
Sent from a galaxy far, far, away....
300Blk makes sense. The only thing that is different than a 5.56 is the barrel. Win-win.
rob
DINO Extraordinaire
I've alway heard that it's a bad idea to use the same BCG in multiple uppers.I like 300 BLK.
The big benefit is magazine, BCG, and lower overlap with 5.56. It's great in shorter barrels, so 16" would be a bit of a waste IMO. If you got a <16" upper, you could always keep the stock off when you have the short upper on making it a pistol. This assumes is started as a pistol, but since you made it from an 80%, who's to say it didn't.
IANAL.
Rob
Sent from my SM-T320 using Tapatalk
DaemonAssassin
Why should we Free BSD?
Go 300BLK. It makes Frosh cry.
Time to start reloading.
Supers are not badly priced. Subs get pricey. I can reload 220gr subs for close to the cost of commercial 5.56. <.25 cents a round.
Yeah I really want it to go big. I think once my AR is built and I am thinking of another upper I may build one in .25-45 sharps and use that for deer. Then I can swap the BCG between them, reuse mags, etc like I can with .300 blackout.
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