Dewey Mack Posted June 9 Report Share Posted June 9 A few weeks ago, I attended the Suppressor Day hosted by East Valley Tactical at Ben Avery with my father and son. My father won this in the raffle but gave it to me since I bought the tickets (lucky me!). So I just purchased a blem BCM upper and going to make my first 300BO build. I will be shooting this suppressed with subs once my can gets out of jail. I'm looking forward to this shorty! Barrel is Mos-tek 5.5" with a Micro gas tube length. Gas port is 0.111" so I hope it will cycle without the suppressor installed, but we'll see. Ready to Ship 300 Blackout Barrel 5.5" 1:5 Twist Zulu Profile, (mos-tek.com) Cheers, Dewey Quote Link to comment Share on other sites More sharing options...
sagebrush Posted June 10 Report Share Posted June 10 very nice, a barrel to start the build. I have heard that even a roll pin will do the same, you're way ahead. will look forward to a function report. Quote Link to comment Share on other sites More sharing options...
Cunuckgaucho Posted June 10 Report Share Posted June 10 Sometimes free ain't cheap... Quote Link to comment Share on other sites More sharing options...
dpete Posted June 10 Report Share Posted June 10 That one will look something like this. Check out the thread about it here: It just might save you some headaches along the way. Quote Link to comment Share on other sites More sharing options...
392heminut Posted June 17 Report Share Posted June 17 This will definitely be an interesting build! Quote Link to comment Share on other sites More sharing options...
unforgiven Posted June 18 Report Share Posted June 18 Cool 😎 Quote Link to comment Share on other sites More sharing options...
Dewey Mack Posted October 25 Author Report Share Posted October 25 Late update, but the build went fairly well besides the micro gas tube not bent correctly. I call it the Trumpinator 😂. The lower is from SOTA in MN; I was going to do an 80% but I really liked their engraving. It's a nice lower that allows an adjustable bolt benieth the rear takedown pin to remove upper/lower slop. They have 80% AR15 & LR308 lowers as well as great prices. I highly recommend them as an option for either. The bolt and buffer tube were cheap, custom laser engraved from KM Tactical. Both work great. Shoots great with subsonic AAC ammo! I tried the 125gr supers but it was a BLAST cannon, but still accurate at 50yd. With the Enticer Ti on the end, it's even better. I'm using KM Tactical solid 5.7oz buffer, standard carbine spring, and fixed gas block. Perfect ejection 3-4:00and cycling with all ammo, with or without the can! I swapped the old red dot for Romeo 5. It's accurate, and I was also able to hit the 200yd plate sitting cross-legged at the range with subsonics (aiming very high 😄). Quote Link to comment Share on other sites More sharing options...
Dewey Mack Posted October 25 Author Report Share Posted October 25 Edit: I straightened the gas tube and made the bends steeper with a cheap harbor freight tube bender that I liberally lubed! I was very careful. The tube was hitting the barrel nut before bending it and the ends weren't parallel at all. I traced it on a piece of paper before bending to show the difference. I bought the tube directly from Mos-tek when I was visiting their shop, so I notified them of the possible quality control issue. Regardless, the barrel shoots great for being so short. For the BCM upper, I popped it into my house oven at 270F for 15 minutes and the barrel slid right on; light tap from rubber mallet to ensure it was seated. I really like that upper since it doesn't require shim stock. I didn't bother squaring the face as it looked like it was already machined flat. Nice stuff from BCM. Quote Link to comment Share on other sites More sharing options...
Magwa Posted October 26 Report Share Posted October 26 sweet! Quote Link to comment Share on other sites More sharing options...
Dewey Mack Posted October 28 Author Report Share Posted October 28 @dpete It went together effortlessly, and ejects perfectly with a fixed gas block, 5.7oz solid deadblow buffer, and standard M4 spring. Supers, Subs, with or without can, all cycle and LRBHO. Only headache was the gas tube, which took maybe 30 minutes to fix. I notice you're a northern Cheesehead. I grew up there in the NW and going back next month for the national holiday of whitetail season to hunt with my dad, son, cousin, and brother-in-law. 👍I'm taking my LR308, and my son will be using my 16" Grendel. Quote Link to comment Share on other sites More sharing options...
dpete Posted October 28 Report Share Posted October 28 8 hours ago, Dewey Mack said: @dpete It went together effortlessly, and ejects perfectly with a fixed gas block, 5.7oz solid deadblow buffer, and standard M4 spring. Supers, Subs, with or without can, all cycle and LRBHO. Only headache was the gas tube, which took maybe 30 minutes to fix. I notice you're a northern Cheesehead. I grew up there in the NW and going back next month for the national holiday of whitetail season to hunt with my dad, son, cousin, and brother-in-law. 👍I'm taking my LR308, and my son will be using my 16" Grendel. As I recall I had a similar issue with the gas tube on mine. My solution was a bit different tho. Once the barrel was in place and the barrel nut tightened down I did a bit of Dremel tool gunsmithing and notched the front face of the nut to allow the tube to fit. With the adjustable gas block it runs supers two clicks from completely shut off. Subs don't cycle at that setting but I have an 8" barrel BLK that is primarily for subs. Quote Link to comment Share on other sites More sharing options...
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