ar15 Rifle length build issue.

[v0lcom13sn0w]

weirdest thing last night happened while building a buddys 18" rifle length SPR...


I definitely am not new to building AR style rifles.last night once we got the rifle all together,we went to put the BCG and Raptor handle in and the bolt would not lock into the barrel lugs... gun would not go into battery.

after about 10 min of head scratching we found that his gas tube measured 15.5" when it should be 15" (IIRC) not allowing the BCG to go into battery.

Am I crazy? could this just be a "well these things are mass produced and one coulda slipped thru QC?" have any of you guys ran into too long of gas tube? its a tube that he ordered from raineer. i guess at this point its time to drive to curts and see if they have one in stock and deal with raineer later.

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[Garg]

Sounds like you have the gas block on backwards. Happened to me once...

 

[v0lcom13sn0w]

Sounds like you have the gas block on backwards. Happened to me once...

gas block cant go in backwards on this particular one

 

[v0lcom13sn0w]

drove to curts. got a new tube. 5" shorter than the raineer tube.

 

[Cameron72]

So your original tube was 1/2" long and your replacement was 5" shorter. Is that fuzzy math?

 

[Garg]

So your original tube was 1/2" long and your replacement was 5" shorter. Is that fuzzy math?

I think he meant .5"

 

[Cameron72]

That works, thanks.

 

[v0lcom13sn0w]

So your original tube was 1/2" long and your replacement was 5" shorter. Is that fuzzy math?

yep my '.' was spaced incorrectly from my 5 it looked like this '. 5' instead of '.5'

 

[jbett98]

Would trimming off .5" been an alternative to buying a replacement?

 

[v0lcom13sn0w]

Would trimming off .5" been an alternative to buying a replacement?

i am not certain if that is an option because its the end that goes into the gas key is flared/bulbed

 

[jbett98]

That's news to me. All I've seen is the tubes end has been tapered with a slight bevel.

 

[v0lcom13sn0w]

news to me too. usually they are how you described. maybe this one was just a Fk up that got past QC. i felt better after purchasing a new one. will deal with raineer later... anywhoo it turned out to be an excellent build

 

[Garg]

It's very odd that you got a gas tube that was exactly .5" too long, as that would definitely not be a standard size. Just weird.

 

[v0lcom13sn0w]

i mean i have the ability and tools to cut it down and taper it no problem just decided to buy the right one.

 

[jbett98]

After thinking about the bulbous tube end, maybe it was the BCG slamming into it that caused that to happen.

 

[v0lcom13sn0w]

After thinking about the bulbous tube end, maybe it was the BCG slamming into it that caused that to happen.

could have been. i just inspected the gas key. its ok. i swapped it into another rifle and shot a mag thru. BCG is ok. have yet to shoot the new rifle.

 

[IronMonster]

I have seen plenty of tubes with the little bulb on the end. This one was handy, its a factory built BCM

 

[IronMonster]

Hard to tell it flares out much from the pic, its slight but it is a bit pushed out.

 

[v0lcom13sn0w]

I have seen plenty of tubes with the little bulb on the end. This one was handy, its a factory built BCM

View attachment 293925

that's exactly what it looks like. the new one from curts isnt like that.