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1/25/2018 7:38:29 AM
Posted: 1/1/2006 11:16:15 AM EST
I'm after you advice here chaps.

we are going to start a club comp at altcar soon and i wanted to get the best results from my rifle, i have the 14.5" 1-8 twist barrel on my AR now, but i was thinking of getting another longer heavy barrel.

Is it simple enought to swap barrels over,( i want to be able to use both barrels at different times ) or would i be better getting another upper ?

Does the barrel just unscrew or is there more to it ?

Or am i wasting my time anyway, the comp will be over 300yds so would i be o.k. with the barrel i have now ?



Link Posted: 1/1/2006 12:23:08 PM EST
Hiya Steve,

I believe that a new upper, (or a new rifle) is the best answer to your question, if you just change the barrel as you require it, you'd also have gauge the head space. I'm not well up on this, I just read it somewhere. There are other's on here who know what they are talking about, who'll correct me if I'm wrong.

I love spending other peep's money. good reason to go invest in a new rifle.


Link Posted: 1/1/2006 12:49:39 PM EST
Upper is definatley better,

You dont have to headspace the ar barrel when swaping it over though,

Next year its a M4 maybe a commando...upper, and a .22 conversion deffinatley... i dont have to buy a bike again this year

Link Posted: 1/1/2006 10:16:15 PM EST
[Last Edit: 1/1/2006 10:22:31 PM EST by steven_uk]
I'd personally go for a new upper, changing barrels would get very old very fast I'd imagine.

ETA - What distance will your comp be shot over ? Up to 300 or in excess of 300 ?
If its the former then I'd imagine that your current setup would suffice ? ?
Link Posted: 1/1/2006 11:05:22 PM EST
14.5" @ 300yds would be OK.
My 16" will make 600yds but beginning to show the distance. I suppose I could cut my groupings down to 2 shots rather than 5, probably turn in some fantastic scores eh 'standbye'
Link Posted: 1/2/2006 12:04:52 AM EST
Go for an upper.
You won't have to use specialist tools and a good firm vice to change the upper but you do with a barrel. Barrel change will take a good half hour if you have all the equipment and are ready to go, an upper change will take 5 mins if you wait for your tea to cool down before you start - and you can do it on the range if needs be. The hardest part will be remembering to take the sling off first before you try and separate the two receivers - doh!

As mentioned above the barrels are all pre-headspaced with the barrel extension that is actually part of the barrel assembly. You can even use the same bolt, especially if the upper was made using your existing bolt to headspace from, but it's not necessary to do so.

Link Posted: 1/2/2006 12:32:28 AM EST
[Last Edit: 1/2/2006 1:00:55 AM EST by Mousegunner-UK]
Your 14.5" carbine setup will do just fine at 300 yards, infact out to 400 should be no major problem unless of course your shooting fig 14s and only looking to hit the A zone.

16" will make it to 600 yards and should still be capable of minute of angle.

You need to a 20" 1:8 twist (or tighter) if you want to make 1000 yards reliably; having said that I had a 18.5" 1:8 twist, 3 groove Lilja that would shoot reliably at 1000 yards all day long until I burnt it out ( still holds the record score for .223 at the PR Nationals, 227 ex 300 in 2000 for the 1000 yard snaps match)

Homeloads of course being the staple diet for all guns to shoot accuratly and reliably, yes of course military/factory will be accurate at most distances even out to 1000 yards but if you want to win then homeloading is the only way to go.

There's too much hassle in changing a barrel to make it a regular routine, not to mention that you will need to zero everytime you do it. Where as changing an upper, well push the pins and swap.

What you will end up doing though is turning the spare barrel and action (the wording you require on your FAC) into a complete rifle at some stage later on. Believe me thats how I started, now I have 8 complete AR's in various forms and calibres.


PS We even tried shooting the M4 carbine at 1000 yards and yes sometimes you got a round on the target frame/face but not very often, more good luck than good shooting

Link Posted: 1/2/2006 2:13:42 AM EST

My comp is going to be at 300yds, and i'm loading my own so i'll give my current setup a good go and maybe change it later in the year if it's not doing the job.

Would it be possible to hit 10 bulls at 300yds

My loads are .223 rem brass, 55gn lapua head, 26gn n140. i've just got some 69gn lapua heads as that seems to be a popular weight choice.

If anyone can see any problems with this load let me know please, ( i know i'll have to change some thing when i use 69gn heads )


2006 altcar 300yd champ (NOT)
Link Posted: 1/2/2006 2:51:55 AM EST
Don't bother with the 55's but load up the 69's with 24.5-25 N140 and go from there.
It's only 300yds so you don't need extreme velocity.
Accuracy is more important

Link Posted: 1/2/2006 7:12:57 AM EST

Originally Posted By streetfighter:
Don't bother with the 55's but load up the 69's with 24.5-25 N140 and go from there.
It's only 300yds so you don't need extreme velocity.
Accuracy is more important


Cheers Mate

I'll load some up and take them with me next week.

I'll let you know the results.

Link Posted: 1/3/2006 11:53:04 AM EST
Hiya Steve, & all,
I just read that spare upper's inevitably grow new lower's after a short time

Link Posted: 1/4/2006 6:37:17 AM EST
I've got a heavy barrel SGC upper I'd like to replace with an M4.............................

Its the 1/8 long fluted braked job.

Any use to you?

Link Posted: 1/4/2006 8:43:58 AM EST

Originally Posted By richardh:
I've got a heavy barrel SGC upper I'd like to replace with an M4.............................

Its the 1/8 long fluted braked job.

Any use to you?


hey Richard,
got any pics of this upper?
Link Posted: 1/4/2006 9:22:57 AM EST
And as if by magic.............

Its a Hart barrel 1/8" twist (maybe 1/9"?) the brake obviously has a moderator thread underneath, its got left and right hand cocking levers plus the original (this might be common to all SGC guns?)

Its hardly been used as I've hardly shot at all the last twelve months.

There is a scratch behind the right hand cocking lever where a screw protruded but other than that its in great nick and on a very low mileage.

According to my size tens its a 24" tube including the brake.

The lower spec is standard but for a fancy grip and Jewell trigger...........you might need a lower to go with it?

Of course the next question is who can do me a deal on a short railed upper

Richard 07966 585979

Link Posted: 1/4/2006 12:40:35 PM EST
thanks for the pics. If it was 20" I'd be interested, but 24" is just too long for me.

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