Free: Contests & Raffles.
OK--I think I see a problem. Looking at your pictures, I'm seeing a rub spot on the barrel between the sight-to barrel rings. And the front handguard mount doesn't look at all like the military style mount, so he had to remove the gas block to change the mounting piece from the barrel. If he drove the pins out towards the right, he blew out the tapered pin holes in the barrel by driving them out the wrong way. The pins that are in there now don't look like the right pins, so the hole in the barrel must be misaligned with the gas block hole. In other words, the pins should have been driven out right-to left. The rub spot on the barrel would indicate otherwise. The sad part is, it's not even a free-float handguard, so all that was gained are the picatinny rails.
Quote from: Heredoggydoggy on April 06, 2013, 05:46:44 PMOK--I think I see a problem. Looking at your pictures, I'm seeing a rub spot on the barrel between the sight-to barrel rings. And the front handguard mount doesn't look at all like the military style mount, so he had to remove the gas block to change the mounting piece from the barrel. If he drove the pins out towards the right, he blew out the tapered pin holes in the barrel by driving them out the wrong way. The pins that are in there now don't look like the right pins, so the hole in the barrel must be misaligned with the gas block hole. In other words, the pins should have been driven out right-to left. The rub spot on the barrel would indicate otherwise. The sad part is, it's not even a free-float handguard, so all that was gained are the picatinny rails. The pins in it look correct to me (they may be in the opposite way - Large side on what was originally the small side based off the idiot marks but that wouldnt matter). I also dont think it would be possible to knock the pins out the wrong way since the FSB is cast metal and it would take more force to push them through than it would handle. The rub mark inside the FSB is most likely from a M4 stlye side sling adapter.
I measured the pins and they are bigger on the right than on the left....Which according to almighty google is correct
Quote from: NoImpactNoIdea on April 06, 2013, 05:50:42 PMQuote from: Heredoggydoggy on April 06, 2013, 05:46:44 PMOK--I think I see a problem. Looking at your pictures, I'm seeing a rub spot on the barrel between the sight-to barrel rings. And the front handguard mount doesn't look at all like the military style mount, so he had to remove the gas block to change the mounting piece from the barrel. If he drove the pins out towards the right, he blew out the tapered pin holes in the barrel by driving them out the wrong way. The pins that are in there now don't look like the right pins, so the hole in the barrel must be misaligned with the gas block hole. In other words, the pins should have been driven out right-to left. The rub spot on the barrel would indicate otherwise. The sad part is, it's not even a free-float handguard, so all that was gained are the picatinny rails. The pins in it look correct to me (they may be in the opposite way - Large side on what was originally the small side based off the idiot marks but that wouldnt matter). I also dont think it would be possible to knock the pins out the wrong way since the FSB is cast metal and it would take more force to push them through than it would handle. The rub mark inside the FSB is most likely from a M4 stlye side sling adapter.The taper on those pins is very slight--almost imperceptible to the naked eye. I know, because I looked at the one that was removed from my barrel when I converted it to a free-float handguard and low-profile gas block.
Quote from: Heredoggydoggy on April 06, 2013, 05:46:44 PMOK--I think I see a problem. Looking at your pictures, I'm seeing a rub spot on the barrel between the sight-to barrel rings. And the front handguard mount doesn't look at all like the military style mount, so he had to remove the gas block to change the mounting piece from the barrel. If he drove the pins out towards the right, he blew out the tapered pin holes in the barrel by driving them out the wrong way. The pins that are in there now don't look like the right pins, so the hole in the barrel must be misaligned with the gas block hole. In other words, the pins should have been driven out right-to left. The rub spot on the barrel would indicate otherwise. The sad part is, it's not even a free-float handguard, so all that was gained are the picatinny rails. I don't believe so that rub spot you are seeing is from the sling mount. to me it doesn't look like he removed the gas block...not saying he didn't but it doesn't appear that way to me
Quote from: Swannytheswan on April 06, 2013, 06:29:53 PMQuote from: Heredoggydoggy on April 06, 2013, 05:46:44 PMOK--I think I see a problem. Looking at your pictures, I'm seeing a rub spot on the barrel between the sight-to barrel rings. And the front handguard mount doesn't look at all like the military style mount, so he had to remove the gas block to change the mounting piece from the barrel. If he drove the pins out towards the right, he blew out the tapered pin holes in the barrel by driving them out the wrong way. The pins that are in there now don't look like the right pins, so the hole in the barrel must be misaligned with the gas block hole. In other words, the pins should have been driven out right-to left. The rub spot on the barrel would indicate otherwise. The sad part is, it's not even a free-float handguard, so all that was gained are the picatinny rails. I don't believe so that rub spot you are seeing is from the sling mount. to me it doesn't look like he removed the gas block...not saying he didn't but it doesn't appear that way to meI'm sorry if my post seemed a bit brusque, but the minute you said that the handguard had been changed, a red flag popped up. I'm by no means an expert AR-15 armorer, but after building my 4 ARs (4 1/2, if you count the parts that are waiting for the arrival of my 5th barrel), and seeing a lot of "Farmer Tight" mods to ARs, something is not right. That mounting plate between the gas block and barrel does not look like the one the military "clam-shell" handguard uses, and to change it, the sight/gas block would have to be removed. If the gun was As Factory, I would not be suspicious, but something is not right with the change, and I'm betting the trouble is there....
Good deal--I'm glad you are on track to getting it fixed. The low-pro gas block I replaced my A2 sight with covers the barrel bands with the pin-holes, and has set-screws to affix it in the right spot, so if the pin holes are boogered, it won't mean the barrel is toast.
