Turbotezza

You're good. Chambering a round should always meet with some resistance. Even when using a headspacing gauge, the instructions will always state the amount of pressure you need to put on the bolt while you do the checking.

I also think that you are now undergassed. I once had a gas key clog up on me and it caused the rifle to short stroke. I soaked and cleaned it up and presto! A fully functional rifle again.

Sent a PM

Nice.

I use car diff lube. Very filmy! ;D

All you need to do is to determine if your current buffer tube is commercial or mil spec and then buy the correct ACS to fit. You can use the same spring and buffer in either type of buffer tubes.

They were out of FDE at the time, si I went to CT instead. Pretty good match to Magoul's FDE.

MRF? Totally cool build! ;)

@Robocop - I got the Restor because I thougt it might tame the longer gas impulse the 18" barrel with the mid length gas system and I must say it works really well. I'd say it is worth a try. @6132Expert - Got it on eb ay

The rifle is brand spanking new and hasn't seen much use yet, so I can't say for sure if it is as durable as Hard coat or not. SI-Defense did the coating and it is done both inside and out. Extra $40 and 6 weeks longer wait time! LOL!

Firstly, thanks to all for the kind words. Good spot. They are sprayed with Coyote Tan Aluma Hyde.

SI-Defense billet matched set poweder coated FDE 18" Rainier Ultramatch barrel PWS FS030 muzzle brake Troy MRF forearm rail & stubby grip Std. DPMS BCG Gissele Super Dynamic trigger Endrine buffer Magpul ACS & MIAD Burris XTM scope on American Defense mounts BCM charging handle MI buffer tube sling adapter

I hope you get yours faster than I did. My FDE plated upper/lower set took them 10 weeks to deliver.

For those interested, the 16" and 18" barrels with the DPMS extensions are back in stock. Move fast! 8)

I'm not saying it can't be done, but AR barrels have the extension pinned to the barrel so it's probably be easier/cheaper just to buy a new one.

They are out of DPMS extension barrels. I checked using the FA and flying BCG only after confirming by hand fitting. See points 2) & 3).

6132 has got it right. Mine's an 18" and bought it 3 or so weeks ago when it was in stock.

This is what I did for my DPMS bolt and Rainier barrel. 1) Removed bolt from carrier, took out the ejector and extractor. 2) Put a GO guage into the bolt. Holding the bolt upright, lowered the barrel over it and confirmed that the bolt would turn(lock) 3) Did the same procedure with the NO GO gauge and confirmed that the bolt would not turn. 4) Replaced the guages with unfired 7.62mm (Surplus) & .308 (PRVI) cartridges and noticed that the .308 was a much tighter fit. 5) Put the extractor back in the bolt and tried to repeat steps 1) to 4) again, but the bolt wouldn't turn on any gauge or cartridge. Checked the extractor and noticed that the lower section of the extractor groove stood proud of the bolt face, tilting the gauge/cartridge ever so slightly so that it wouldn't sit flat in the bolt. This slight alignment wouldn't let the bolt lock up. With a Dremel cutting disc, I slightly ground down the lower bit of the extractor grove so that it was flush with the bolt face. Tested the guages/cartridges again and confirmed proper function. 6) Put the ejector back into the bolt, the bolt assembly back into the carrier. Assembled the rifle and checked headspace again with the guages, first slowly lowering the bolt carrier over the guages and using the forward assist to fully close, and then checking again by letting the carrier fly forward under the power of the main spring. As a side note. Rainier barrels are chambered very tight, barely closing on the GO gauge with my bolt and should hopfully be a consistent tack driver.

SI is closed for the shot SHOW till 1/22.