|
|
Joined: Jan 2001
Posts: 18,075
Campfire Ranger
|
OP
Campfire Ranger
Joined: Jan 2001
Posts: 18,075 |
Well almost a year later swapped the upper onto a well used lower and swapped bolt carrier groups with one that didn't have the M-4/M-16 bcg and had previously loosened the gas block to check for port to port alignment and it appeared to have been aligned.
It went from never feeding to 4-5 hiccups out of 20 rds, will order a Nemo buffer spring specifically engineered for .300 blackouts and hopefully that will get me to 100% reliable.
Mike
God, Family, and Country.
NRA Endowment Member
|
|
|
|
|
Joined: Oct 2002
Posts: 96,121
Campfire Oracle
|
|
Campfire Oracle
Joined: Oct 2002
Posts: 96,121 |
They are interesting for idiots like us that know little about them. They are beginning to grow on me.
"Dear Lord, save me from Your followers"
|
|
|
|
|
Joined: Jan 2001
Posts: 18,075
Campfire Ranger
|
|
OP
Campfire Ranger
Joined: Jan 2001
Posts: 18,075 |
I was going to build a 6.8 SPC as a wet weather deer rifle, have to have some excuse you know, but once this round was commercialized and the fact it uses standard mags sold me real quickly on it over the SPC.
Will post results once I get the spring in.
Mike
God, Family, and Country.
NRA Endowment Member
|
|
|
|
|
Joined: Jan 2005
Posts: 57,474
Campfire Kahuna
|
|
Campfire Kahuna
Joined: Jan 2005
Posts: 57,474 |
late to this party... don't drill... get a couple hundred rounds through the gun first...
New gas guns typically need things to smooth up a bit, and keep the BCG and upper lubed well as it breaks in.
Then, if it doesn't work, IMHO an adj gas block is by far smarter than drilling a hole... especially if you are going suppressed and different ammo later.
BUt as noted you can drill, then tap, plug and redrill like a redneck. Could even put jb in the port hole and drill smaller...
We can keep Larry Root and all his idiotic blabber and user names on here, but we can't get Ralph back..... Whiskey Tango Foxtrot, over....
|
|
|
|
|
Joined: Jan 2001
Posts: 18,075
Campfire Ranger
|
|
OP
Campfire Ranger
Joined: Jan 2001
Posts: 18,075 |
10-4, I appreciate it, I don't think it will be necessary to drill it now.
The rifle has 40 rds through it, last year at this time I was crippled up with bulging discs in my back and didn't/couldn't do much.
I like the idea of an adjustable gas block and once I get it reliable and broken in will decide on final configuration.
Mike
God, Family, and Country.
NRA Endowment Member
|
|
|
|
|
Joined: Jan 2005
Posts: 57,474
Campfire Kahuna
|
|
Campfire Kahuna
Joined: Jan 2005
Posts: 57,474 |
I don't think going with a can you could do it any otehr way and be able to tune, to cylce, and then flip to super sonic and without the can and so on. IMHO.
First 100 rounds through a top line barrel like a Krieger sometimes will even have a few hiccups, much less over time since they pretty much figured everythign out, but still you never know. Though I did set a range record once on about the round count of 150/200 or so range...
We can keep Larry Root and all his idiotic blabber and user names on here, but we can't get Ralph back..... Whiskey Tango Foxtrot, over....
|
|
|
|
|
Joined: Oct 2014
Posts: 4,755
Campfire Tracker
|
|
Campfire Tracker
Joined: Oct 2014
Posts: 4,755 |
Then, if it doesn't work, IMHO an adj gas block is by far smarter than drilling a hole... especially if you are going suppressed and different ammo later.
An adjustable gas block won't do a thing on an undergassed barrel. You'd need to drill the hole out too big first, then the adjustable block would be effective. I disagree that he needs to just keep shooting it. If it won't cycle at this point, it's undergassed and needs to have the gas port opened up a little. If you go in small steps, you can get it tuned perfectly that way. I would drill instead of messing with special buffers. Some of that "special for 300 Blk" stuff is just marketing snake oil; just tune it right, same as you would a 5.56.
|
|
|
|
|
Joined: Jan 2001
Posts: 18,075
Campfire Ranger
|
|
OP
Campfire Ranger
Joined: Jan 2001
Posts: 18,075 |
Carbine std buffer just a different spring.
Mike
God, Family, and Country.
NRA Endowment Member
|
|
|
|
|
Joined: Jan 2001
Posts: 18,075
Campfire Ranger
|
|
OP
Campfire Ranger
Joined: Jan 2001
Posts: 18,075 |
God, Family, and Country.
NRA Endowment Member
|
|
|
|
|
Joined: Jul 2007
Posts: 442
Campfire Member
|
|
Campfire Member
Joined: Jul 2007
Posts: 442 |
Headspace checked on an AR lol...I must be one lucky SOB I have built around 60 plus ARs not one has ever been checked. Barrel can only go so far back and the bolt can only go so far forward. If it chambers a round and ejects it's good to go.
"One good Shot Is All I Need"
|
|
|
|
|
Joined: Jan 2005
Posts: 57,474
Campfire Kahuna
|
|
Campfire Kahuna
Joined: Jan 2005
Posts: 57,474 |
Then, if it doesn't work, IMHO an adj gas block is by far smarter than drilling a hole... especially if you are going suppressed and different ammo later.
An adjustable gas block won't do a thing on an undergassed barrel. You'd need to drill the hole out too big first, then the adjustable block would be effective. I disagree that he needs to just keep shooting it. If it won't cycle at this point, it's undergassed and needs to have the gas port opened up a little. If you go in small steps, you can get it tuned perfectly that way. I would drill instead of messing with special buffers. Some of that "special for 300 Blk" stuff is just marketing snake oil; just tune it right, same as you would a 5.56. All I can say is having went through a LOT of barrels in competition, it was not unusual to have a gun barely function or not function quite right until everything was slicked up some. Generally on totally new uppers. Its easy to put an Adj block on. And wide open if it doesn't cycle after 100 rounds, then open it some. Goign subs and with a can you may have to open it even more. But its VERY rare to have a factory tube undergassed. I wonder if the base for the block is not lined up with the port completely?
We can keep Larry Root and all his idiotic blabber and user names on here, but we can't get Ralph back..... Whiskey Tango Foxtrot, over....
|
|
|
|
|
Joined: Jan 2005
Posts: 57,474
Campfire Kahuna
|
|
Campfire Kahuna
Joined: Jan 2005
Posts: 57,474 |
Headspace checked on an AR lol...I must be one lucky SOB I have built around 60 plus ARs not one has ever been checked. Barrel can only go so far back and the bolt can only go so far forward. If it chambers a round and ejects it's good to go. If you use good parts you are ok. Bolt with barrel. If you don't, you can have enough headspace to make brass life very short if you don't understand headspace or reloading. If just making it go bang is the desire its fairly hard to mess up. If you are putting em together for others and don't have 60 plus of your own and you are not not overly smart about that part. Its one thing to have a possible mistake for you, but for others....
We can keep Larry Root and all his idiotic blabber and user names on here, but we can't get Ralph back..... Whiskey Tango Foxtrot, over....
|
|
|
|
|
Joined: Mar 2004
Posts: 12,806
Campfire Outfitter
|
|
Campfire Outfitter
Joined: Mar 2004
Posts: 12,806 |
In ARs, proper headspace happens with chambering, not with bolt selection.
Islam is a terrorist organization.
|
|
|
|
|
Joined: Jan 2005
Posts: 57,474
Campfire Kahuna
|
|
Campfire Kahuna
Joined: Jan 2005
Posts: 57,474 |
yes,and I"m not sure who you are replying to, but if you buy a bolt headspaced to the barrel you are fine. Thats what I was saying.
OTOH you can swap bolts back and forth and find minor changes in headspace at times, just due to bolt tolerances.
The cheap way out, put one together, fire a few cases and read them on an RCBS headspace gauge for fired brass.
We can keep Larry Root and all his idiotic blabber and user names on here, but we can't get Ralph back..... Whiskey Tango Foxtrot, over....
|
|
|
|
|
Joined: Mar 2004
Posts: 12,806
Campfire Outfitter
|
|
Campfire Outfitter
Joined: Mar 2004
Posts: 12,806 |
Just a general observation for the OP. If he thinks he's going to fix headspace with a new bolt, he's schitt out of luck. Ain't happening.
Just grab a bolt out of that box of 1,000 and slap it in. It will work as good as any other bolt in a box of 1,000.
Islam is a terrorist organization.
|
|
|
|
|
Joined: Oct 2014
Posts: 4,755
Campfire Tracker
|
|
Campfire Tracker
Joined: Oct 2014
Posts: 4,755 |
Its easy to put an Adj block on. And wide open if it doesn't cycle after 100 rounds, then open it some. Goign subs and with a can you may have to open it even more.
Easy to do, but completely useless on a barrel that's already undergassed. Being undergassed is not that rare when you get away from 5.56, especially if his 300 barrel has carbine gas. Someone may have just used the same port size as a 5.56 barrel, which would explain the issues he is reporting.
|
|
|
|
|
Joined: Jan 2005
Posts: 57,474
Campfire Kahuna
|
|
Campfire Kahuna
Joined: Jan 2005
Posts: 57,474 |
No way in heck you would use same gas port as 5.56
But maybe in this day and time folks are generally stupid I guess. It well could be.
Never seen mass makers drill ports to small in the day, always to big.
For 300/221 you shoot it sub sonic at some point, its the whole reason for the round, and for that, you need to open the port up big enough, then when going back to supers, you need to close it. Hence eventually needing an Adj gas block even after the initial problem is solved.
We can keep Larry Root and all his idiotic blabber and user names on here, but we can't get Ralph back..... Whiskey Tango Foxtrot, over....
|
|
|
|
|
Joined: Jan 2005
Posts: 57,474
Campfire Kahuna
|
|
Campfire Kahuna
Joined: Jan 2005
Posts: 57,474 |
I bet, and I don't recall because I've had the Rock barrel around so long, that a Rock barrel for 300/221 is not undergassed nor does it have a 5.56 port size( which are generally to big to start with anyway IMHO)
We can keep Larry Root and all his idiotic blabber and user names on here, but we can't get Ralph back..... Whiskey Tango Foxtrot, over....
|
|
|
|
|
Joined: Jan 2001
Posts: 18,075
Campfire Ranger
|
|
OP
Campfire Ranger
Joined: Jan 2001
Posts: 18,075 |
Spring came in today, noticeably softer, smaller wire and less pressure to compress, wider coils, feels like it will be great, hope to test tomorrow at lunch or at least after work.
Mike
God, Family, and Country.
NRA Endowment Member
|
|
|
|
|
Joined: Jan 2001
Posts: 18,075
Campfire Ranger
|
|
OP
Campfire Ranger
Joined: Jan 2001
Posts: 18,075 |
Got the new spring in and finally got a chance to test it, had a minor magazine problem then it ran like a top. First 5 shot group at 100, I don't have a clue about the stray round, I put 2-3 rds on paper at 50 yards prior to this group and it sat while I went down and hung the target ![[Linked Image]](http://i226.photobucket.com/albums/dd263/mgreen_011/24%20hour/.300_zpssoo9kl63.jpg) Mike
God, Family, and Country.
NRA Endowment Member
|
|
|
|
|
479 members (12344mag, 17CalFan, 10gaugemag, 1beaver_shooter, 10gaugeman, 19rabbit52, 55 invisible),
2,683
guests, and
1,214
robots. |
|
Key:
Admin,
Global Mod,
Mod
|
|
|
Forums81
Topics1,190,713
Posts18,456,946
Members73,909
| |
Most Online11,491
Jul 7th, 2023
|
|
|
|
