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Let's say we wanted to make a clone/near-copy of the Sig XM5..
Posted on 10/29/22 at 8:25 am
Posted on 10/29/22 at 8:25 am
So I looked at this rifle some online, supposedly the next-gen rifle for the Army. Seems interesting, and obviously very proprietary at this point... and also quite pricy.
Best I'm seeing is about $8k
LINK
Was seeing if we could piece together a poor man's version;
So, it's built around the .277x51 (.277 Fury) rd. Has a collapsable, foldable stock. Piston-driven action, with both the regular T charging handle, and a non-reciprocating left charging handle.
Sounds like you could get close with an AR-10/AR-308 lower with folding adapter,
LINK
Go from there?
Need to find a piston-driven upper, with a left-side non-reciprocating handle
That also can take a regular charging handle.
I've seen some close, but all in AR 15 style (smaller caliber, like 556).
Can this be pieced together?
Best I'm seeing is about $8k
LINK
Was seeing if we could piece together a poor man's version;
So, it's built around the .277x51 (.277 Fury) rd. Has a collapsable, foldable stock. Piston-driven action, with both the regular T charging handle, and a non-reciprocating left charging handle.
Sounds like you could get close with an AR-10/AR-308 lower with folding adapter,
LINK
Go from there?
Need to find a piston-driven upper, with a left-side non-reciprocating handle
That also can take a regular charging handle.
I've seen some close, but all in AR 15 style (smaller caliber, like 556).
Can this be pieced together?
2
Posted on 10/30/22 at 12:37 am to Scoob
quote:
Can this be pieced together?
Likely not, especially if you want a piston upper with no buffer tube system. Even in 308, that's going to be a bitch to find. No way you're going to find it in 277 fury.
Closest you may get is a 6.5 Creedmoor platform, but they are mostly all traditional DI versions. LMT makes a pretty good one.
Don't worry, though. If you really want something close, just get a SCAR 17 w/NRCH. Yeah, it's still $3000+, but it's way cheaper than and more available than the SIG.
Posted on 10/30/22 at 10:41 am to Jack Ruby
From https://en.wikipedia.org/wiki/XM5_rifle
The XM5 weighs 8.38 lb (3.80 kg), or 9.84 lb (4.46 kg) with a suppressor, and has a basic combat load of 140 rounds in seven 20-round magazines weighing 9.8 lb (4.4 kg). Compared to the M4A1 weighing 6.34 lb (2.88 kg) unsuppressed with a basic combat load of 210 rounds in seven 30-round magazines weighing 7.4 lb (3.4 kg), the XM5 weighs about 2 lb (0.91 kg) more and a rifleman carries roughly a 4 lb (1.8 kg) heavier load with 70 fewer rounds
That sit odd with any of you? I’m not so sure I’d like the 70 fewer round thing so much. I get the trade offs, I do, but 70 seems like quite a lot ‘missing’ from a standard rollout. I’m old enough that we carried ours in 782, or ‘deuce’ gear. 6+1 mag would have been two mag carriers back then, and one in the rifle.
The XM5 weighs 8.38 lb (3.80 kg), or 9.84 lb (4.46 kg) with a suppressor, and has a basic combat load of 140 rounds in seven 20-round magazines weighing 9.8 lb (4.4 kg). Compared to the M4A1 weighing 6.34 lb (2.88 kg) unsuppressed with a basic combat load of 210 rounds in seven 30-round magazines weighing 7.4 lb (3.4 kg), the XM5 weighs about 2 lb (0.91 kg) more and a rifleman carries roughly a 4 lb (1.8 kg) heavier load with 70 fewer rounds
That sit odd with any of you? I’m not so sure I’d like the 70 fewer round thing so much. I get the trade offs, I do, but 70 seems like quite a lot ‘missing’ from a standard rollout. I’m old enough that we carried ours in 782, or ‘deuce’ gear. 6+1 mag would have been two mag carriers back then, and one in the rifle.
Posted on 10/30/22 at 10:58 am to 21zereaux
I’m curious to see how well these guns hold up to thousands of rounds with such a high pressure (80KPSI). The 5.56 62 Gr NATO is 65k PSI. The ballistics of the round are very impressive but being reliable in combat is another story.
Posted on 10/30/22 at 5:59 pm to lsufan1971
They are only using the high pressure rounds in combat. Lower pressure rounds without the stainless base will be used outside of combat.
Posted on 10/31/22 at 6:15 am to 21zereaux
quote:Bigger rifle, bigger rd, less ammo... seems like they're responding to the last couple conflicts, where range/distance played a factor.
That sit odd with any of you? I’m not so sure I’d like the 70 fewer round thing so much. I get the trade offs, I do, but 70 seems like quite a lot ‘missing’ from a standard rollout.
Not sure we need a new caliber, kinda seems like 7.62 NATO would have been good (and we should have lots of it). I get that you want to defeat newer body armor, but otherwise 5.56 seemed just fine if you are looking at any urban settings (less than 300m).
Posted on 10/31/22 at 3:03 pm to Scoob
I admit to largely being a traditionalist. After all, while I was still in high school I bought my first big game rifle, a Winchester M70 in 270 Win w/ a Leupold 3-9X scope. 
So from my quick read on the 277 Fury, it looks like a 270 Win in a short action w/ an extra 200-300 fps (in same length barrels), but at the expense of an extra 15K psi chamber pressure and using special bi-metal brass. There may be some military applications for it, but I don't see any advantages for the hunter over the pre-existing 270 Win, 270 WSM, 270 Weatherby and 27 Nosler.
-Will the bi-metal "brass" be available to civilian handloaders? If not, one will be using traditional brass and I'd think chamber pressures would be restrained to 65K psi. At that point, you'd have a short action 27 caliber bullet traveling less fps than a 270 Winchester, basically a 27-08.
-If the b-imetal "brass" is available, how much will it cost?
-Can the stainless steel base of the bi-metal "brass" be resized w/ traditional dies?
-Can today's typical bolt actions safely handle the 80K psi rounds?
I don't hunt w/ rifles anymore, but that'd be too many question for me.
So from my quick read on the 277 Fury, it looks like a 270 Win in a short action w/ an extra 200-300 fps (in same length barrels), but at the expense of an extra 15K psi chamber pressure and using special bi-metal brass. There may be some military applications for it, but I don't see any advantages for the hunter over the pre-existing 270 Win, 270 WSM, 270 Weatherby and 27 Nosler. -Will the bi-metal "brass" be available to civilian handloaders? If not, one will be using traditional brass and I'd think chamber pressures would be restrained to 65K psi. At that point, you'd have a short action 27 caliber bullet traveling less fps than a 270 Winchester, basically a 27-08.
-If the b-imetal "brass" is available, how much will it cost?
-Can the stainless steel base of the bi-metal "brass" be resized w/ traditional dies?
-Can today's typical bolt actions safely handle the 80K psi rounds?
I don't hunt w/ rifles anymore, but that'd be too many question for me.
This post was edited on 10/31/22 at 9:48 pm
Posted on 10/31/22 at 5:23 pm to Scoob
quote:
piston-driven upper
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