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Discussion Starter · #1 · (Edited)
This may have been addressed before, I'm not sure. I was wondering if it were possible to ream/re-line bore the OEM 16s barrel to accommodate the .300blk's cartridge case profile and 7.62 projectile? I assume this would first require having the 16s' barrel O.D. being equal to the 17s'. I am aware if this is even possible it would destroy the chrome lining and that's fine, there are other bore treatments available. Does anyone know if the 16s and 17s have the same barrel O.D. as this would be a good starting point. I know Midwest Gun Works had a custom 16s .300blk at the 2015 Shot Show and it got me to wondering. I also know that the .300blk is NOT as simple as swapping the barrel and requires bolt carrier lightening and a different recoil spring to cycle properly. I do not like the HDD .300blk conversion and wouldn't necessarily even trust the company. Just curious here, anyone have any ideas or input? Thanks...

MGW 16s .300blk
View attachment 36817
 

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The power up your scar promotion came with a dvd that said they were going to release 300 black out barrels. I'm not holding my breath though since it took 3+ years before they released drop in barrels for scar platform.
 

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Discussion Starter · #3 ·
I'm certainly not holding my breath for FNH USA to do anything which is why I might be interested in doing the mod myself if it's possible. Reaming the chamber shouldn't be much of an issue, line boring the barrel to 7.62 could be if there's not enough "meat" on the OEM 16s barrel. I'm going to go suppressed one way or the other, having a suppressor shooting supersonic 5.56 rounds seems a rather self-defeating purpose to me. I'd much prefer to shoot a subsonic round and have the rifle actually cycle which a subsonic 5.56/SCAR combo will not!

The power up your scar promotion came with a dvd that said they were going to release 300 black out barrels. I'm not holding my breath though since it took 3+ years before they released drop in barrels for scar platform.
 

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Reaming a barrel is probably not all you would have to do. I would think modifying the gas block would be order as well. All in all modifying a scar 16 seems like too much work and money to get 300blk in the platform reliably. If it were me I would just buy a 300blk barrel assembly from someone like hdd and take my chances it would work well.
 

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Discussion Starter · #6 ·
No doubt, it's not just a simple barrel mod. If you look at the MGW photo, it looks like that's a standard SCAR gas block to me, maybe playing with some gas screws would be needed too. I know it'll also require bolt carrier lightening as I indicated in the OP. As for HDD, I read and see things that lead me not to trust the company and their .300blk conversion has its own gas block necessitating a different front BUIS which I will not even entertain. The pertinent question for those who own both a 17s and 16s along with an accurate measuring tool, what is the O.D. of each barrel, are they the same?

Reaming a barrel is probably not all you would have to do. I would think modifying the gas block would be order as well. All in all modifying a scar 16 seems like too much work and money to get 300blk in the platform reliably. If it were me I would just buy a 300blk barrel assembly from someone like hdd and take my chances it would work well.
 
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Discussion Starter · #8 ·
I have to assume MGW/HDD/AAC resolved gas/cycling issues. As for absolute silence not really looking for that, just a sub-s that will cycle.

imho 300blk really shines in a a15 di platform. It is designed that way and the most quiet supressed. Adding a piston introduces gas issues, cycling issues and noise
Yes, please do and let me know what you come up with. :?

The ods are different as the 16 is a pencil barrel. ill take some measurements when I get a chance
 

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17 OD .670
16 OD .590

I would suggest finding a spare 16 barrel, strip it, and have someone profile a barrel in 300BLK, or wait for FN, or go to another platform. I would not attempt a barrel relining since it needs to be over bored for the liner and it would be paper thin in the end.

my .02
 
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Discussion Starter · #10 ·
Annnnd we're done here! Thanks Tal! :?

Oh well, it was worth the time to pose the question. I will have that spare 16s barrel to strip as soon as my OEM 14" arrives. FN may never actually offer the .300blk.

17 OD .670
16 OD .590

I would suggest finding a spare 16 barrel, strip it, and have someone profile a barrel in 300BLK, or wait for FN, or go to another platform. I would not attempt a barrel relining since it needs to be over bored for the liner and it would be paper thin in the end.

my .02
 

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Discussion Starter · #12 ·
My other option is the SIG556Xi, then of course it's a race to see (FN or SIG) who actually offers the 300blk barrel first. You know, you planted this .300blk seed, are YOU happy now!?!........ :evil:

And another reason I'm just going to go with 300BLK in a AR setup, I really like the 16 even more than the 17 but I don't really have much of a problem running AR's so I'm not worried.
 
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imho 300blk really shines in a a15 di platform. It is designed that way and the most quiet supressed. Adding a piston introduces gas issues, cycling issues and noise

Agree-- love my noveske 300 black, but if if if if if if-- it were to happen- I would try a drop in barrel for the 300 on the 16/17.
 

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Discussion Starter · #14 ·
The problem here is, I washed my hands of the DI AR platform, not going backwards only piston and only forward. Call me odd and/or stubborn and/or strange been called it all, more colorful and worse before.

Agree-- love my noveske 300 black, but if if if if if if-- it were to happen- I would try a drop in barrel for the 300 on the 16/17.
 
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My other option is the SIG556Xi, then of course it's a race to see (FN or SIG) who actually offers the 300blk barrel first. You know, you planted this .300blk seed, are YOU happy now!?!........ :evil:
Hey, I held out since it came out, not my problem if your weaker willed :-D

I don't have a problem with DI but if I could get a 300BLK in the SCAR it would make clean up a little easier but with a suppressor other calibers are still messy so it's not like it's completely mess free.
 
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Discussion Starter · #16 · (Edited)
Yeah, it seems I am weak willed when it comes to firearms, and you wasted no time rub'n it in did'ya? I see how you are..... :th_laughing:

Since coming to this forum I have consistently claimed that the fewer firearms the better and yet I keep adding to the collection. So now, thanks to Sig I may be able to have my cake and eat it too.......well maybe. Oh and, yes ease of cleaning is one thing with a piston but let's not forget that awesome blast of gaseous hotness in the face that comes from shooting suppressed DI AR's that I was so fond of many moons ago......no more, thank you very much! :NO:

Hey, I held out since it came out, not my problem if your weaker willed :-D

I don't have a problem with DI but if I could get a 300BLK in the SCAR it would make clean up a little easier but with a suppressor other calibers are still messy so it's not like it's completely mess free.
 
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Yeah, it seems I am weak willed when it comes to firearms, and you wasted no time to rub it in did'ya, I see how you are..... :th_laughing:

Since coming to this forum I have consistently claimed that the fewer firearms the better and yet I keep adding to the collection. So now, thanks to Sig I may be able to have my cake and eat it too.......well maybe. Oh and, yes ease of cleaning is one thing with a piston but let's not forget that awesome blast of gaseous hotness in the face that comes from shooting suppressed DI AR's that I was so fond of many moons ago......no more, thank you very much!
But depending on the wind direction I still receive a face full of gas from my 16 and 17 (and yes I do flip the regulator correctly) so just keep in mind you can still get a face full of gas with a piston system, that gas goes somewhere and it's still in front of you. This is just a FWI and not trying to build up a argument for DI or beat down piston systems. :wink: Just my experience for shooting a lot of suppressed rifles.
 
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Discussion Starter · #18 ·
Apparently you didn't get the memo, on page 9127 of the USGI SCAR Operator's Manual Addendum it clearly states that "all hot-gaseous-in-the-face-awesomeness commonly associated with FN's competitors is magically dissipated within the xtree-special SCAR gas block". I'll send you a copy... :biggrin:

But depending on the wind direction I still receive a face full of gas from my 16 and 17 (and yes I do flip the regulator correctly) so just keep in mind you can still get a face full of gas with a piston system, that gas goes somewhere and it's still in front of you. This is just a FWI and not trying to build up a argument for DI or beat down piston systems. :wink: Just my experience for shooting a lot of suppressed rifles.
 
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