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Posted: 4/3/2020 2:43:58 PM EDT
[#1]
I initially used a standard gas block on my Criterion bbl because I wanted to keep things as simple as possible. I ended up replacing it. l
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Posted: 4/3/2020 3:12:48 PM EDT
[#2]
Quote HistoryQuoted: I initially used a standard gas block on my Criterion bbl because I wanted to keep things as simple as possible. I ended up replacing it. l @Rezneck So, what exactly caused you to switch to an adjustable? Did your gun not run reliably with a standard gas block? Also, which barrel did you have? |
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Posted: 4/4/2020 11:59:36 AM EDT
[#3]
Finally complete. Sadly, it will be awhile before I can get it to the range.
  Attached FileM5E1 .308 Criterion 16" nitride hybrid barrel Brownells nitride carrier with a JP headspaced bolt. Radian CH BAD ambi safety Slash's XH 8.5oz heavy buffer and spring kit. MBT trigger Magpul GenII UBR, K2+ grip and bipod. SLR AGB Primary arm Plx1-8 Griffin mil in an ADM Recon mount. Troy BUIS Once I get my AAC SDN6 back from AAC for a repair, it will live on this gun. |
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Posted: 4/4/2020 12:47:07 PM EDT
[#4]
Quote HistoryQuoted: Finally complete. Sadly, it will be awhile before I can get it to the range. https://www.AR15.Com/media/mediaFiles/77315/20200404_113741_jpg-1350330.JPG M5E1 .308 Criterion 16" nitride hybrid barrel Brownells nitride carrier with a JP headspaced bolt. Radian CH BAD ambi safety Slash's XH 8.5oz heavy buffer and spring kit. MBT trigger Magpul GenII UBR, K2+ grip and bipod. SLR AGB Primary arm Plx1-8 Griffin mil in an ADM Recon mount. Troy BUIS Once I get my AAC SDN6 back from AAC for a repair, it will live on this gun. Looks like an awesome build! I hope the ranges around me open up soon so I can shoot mine as well.  |
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Posted: 4/4/2020 1:31:57 PM EDT
[#5]
Quote HistoryQuoted: Looks like an awesome build! I hope the ranges around me open up soon so I can shoot mine as well. I have access to a 300yrd range to sight it in and function check it. However, I am "essential" and simply don't have the available time. I am also lacking in various .308 ammo to see what the gun likes. I am hopeful that it really likes 168gr FGMM, as I have about 100rds of that, but I am willing to test others before making a large purchase to stock up on. And I am sure as hell not going to make a large purchase with some of the current pricing due to the "crisis". |
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Posted: 4/4/2020 1:52:37 PM EDT
[#6]
Quote HistoryQuoted: @Rezneck So, what exactly caused you to switch to an adjustable? Did your gun not run reliably with a standard gas block? Also, which barrel did you have? 20" Nitride .308 bbl. It was cycling pretty hard. Kicking brass 15 feet @ 1:30 - 2:00. The front of the port and even the back edge of the rail was getting dinged with brass. It would cycle 10 round P-mags but not 20 round D&H mags. The P-Mags have a stiffer spring than the D&H. I installed a stiffer buffer spring and adjustable gas block and it seems to work fine now. I haven't had the time to really ring it out. yet. |
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Posted: 4/4/2020 8:27:40 PM EDT
[#7]
Quote HistoryQuoted: 20" Nitride .308 bbl. It was cycling pretty hard. Kicking brass 15 feet @ 1:30 - 2:00. The front of the port and even the back edge of the rail was getting dinged with brass. It would cycle 10 round P-mags but not 20 round D&H mags. The P-Mags have a stiffer spring than the D&H. I installed a stiffer buffer spring and adjustable gas block and it seems to work fine now. I haven't had the time to really ring it out. yet. Thanks for the details. I guess I will see how mine works when I get it on the range. |
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Posted: 4/6/2020 5:28:21 PM EDT
[#8]
Quote HistoryQuoted: Hopefully somebody can answer this for me... Are there any Geissele rails that are compatible with the Aero .308 M5? Unfortunately, no. @wayfaerer320 |
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Posted: 4/8/2020 5:21:30 PM EDT
[#9]
Quote HistoryQuoted: A couple 2x4s sitting vertically in a vise, and I put the upper in sideways (top and bottom of the upper are sitting side to side in the vise/2x4s). Also, I'm careful to not over tighten it. This ^^^ is what I will be doing when I receive all of my parts. 
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Posted: 4/10/2020 8:49:08 PM EDT
[#10]
Just need to order an optic, slap on the Harris bipod and spray paint it all. Sorry for the crappy phone pic
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Posted: 4/10/2020 8:53:24 PM EDT
[#11]
Quote HistoryQuoted: Just need to order an optic, slap on the Harris bipod and spray paint it all. Sorry for the crappy phone pic https://www.AR15.Com/media/mediaFiles/214520/20200410_185729-1361448.jpg Looks damn good. |
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Posted: 4/10/2020 9:30:47 PM EDT
[#12]
Quote HistoryQuoted: Just need to order an optic, slap on the Harris bipod and spray paint it all. Sorry for the crappy phone pic https://www.AR15.Com/media/mediaFiles/214520/20200410_185729-1361448.jpg Looks great! What barrel are you using? |
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Posted: 4/10/2020 9:32:23 PM EDT
[#13]
Quote HistoryQuoted: Looks great! What barrel are you using? Quote HistoryQuoted: Quoted: Just need to order an optic, slap on the Harris bipod and spray paint it all. Sorry for the crappy phone pic https://www.AR15.Com/media/mediaFiles/214520/20200410_185729-1361448.jpg Looks great! What barrel are you using? It's an 18" Criterion in 6.5 |
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Posted: 4/10/2020 9:35:44 PM EDT
[#14]
Quote HistoryQuoted: It's an 18" Criterion in 6.5 Awesome, I look forward hearing how it shoots! |
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Posted: 4/11/2020 12:06:16 AM EDT
[#15]
Quote HistoryQuoted: I've been sitting on 400 rounds of 308 for almost a decade with plans to buy or build a rifle that can use it. Hasn't been a priority, but I figured if I wanted one, 2020 is a good year to check that box (honestly need to be checking a lot more boxes before November if funds allow). Aero blems and sales are making this possible. Got the lower on sale for $120 I believe. Upper was a blem, parts kits were on sale, CDNN had the complete 308 buffer/stock kit for $29.99...Strike while the iron is hot. I'm going to give the BCG recommended by @Lonestar12 a shot. It's probably been addressed already, but does the PRI 762 Gasbuster CH work with the Aero lower without modifications? https://uniim1.shutterfly.com/ng/services/mediarender/THISLIFE/021024940703/media/125052221733/large/1583846012/enhance I'm sure you already got your answer, but the PRI Gasbusters work well with zero modifications. I used one until just recently. If you're looking for a black one still let me know. I'd come off of this one for less than new one. Is that tripod the one from Hog Saddle? If so, what do you think of it? |
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Posted: 4/11/2020 1:06:04 PM EDT
[#16]
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Posted: 4/11/2020 2:00:14 PM EDT
[#17]
Anyone have any feedback on the KAK 18” .308 stainless with a rifle length gas?
 |
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Posted: 4/14/2020 7:38:17 AM EDT
[#18]
I did a test fit of all my upper components on Sunday. I was worried about the gas block fitting under the S-one. Everything cleared with plenty of room.
M5 Upper Receiver Wilson Combat 16” Ranger Profile 6.5 CM Barrel 15” Atlas S-One SLR Rifleworks Sentry S7 Gas block JP LMOS bolt with HP Enhanced Bolt PRI Gas buster charging handle  Attached File |
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Posted: 4/14/2020 9:28:07 PM EDT
[#19]
Got my build completed last weekend. I also went with a Magpul RLS sling so I could sling up Rhodesian quick loop style or cinched down 1907 style.
 Here's a break down of my parts list. Lower Aero M5 Lower Receiver Aero Lower Parts Kit - Trigger Assembly Geissele G2S Trigger BCM A5 Receiver Extension Armalite AR10 EA1095 Recoil Spring BCM H3 Buffer PWS Ratchet QD End Plate Magpul ACS Stock Blueforce Gear ULOOP Magpul K2+ Grip Upper Aero M5 Upper Receiver Aero Upper Parts Kit Raptor LT 7.62 Charging Handle Aero M5 Phosphate Bolt Carrier Criterion Head Spaced Fulton Bolt Criterion 18", Nitrided, Hybrid .308 Barrel Surefire Warcomp 762 SOLGW Low Profile Gas Block Spikes Nitrided Rifle Gas Tube CMT Tactical UPHR 15.0 Mod 2-HP Handguard ADM 20 MOA(6 MIL) Recon Scope Mount Weaver Tactical 3-15X50mm Scope With EMDR Reticle Butler Creek Scope Lens Covers Troy Folding Rear Battle Sight Troy Folding Front Battle Sight Magpul MLOK Bipod Magpul MLOK QD Mount Magpul RLS Sling I hand lapped the upper receiver in the vertical position. I just used hand pressure and the weight of the lapping tool. I feel like it gave me more control than using a drill and only took a couple of minutes longer. I also used .001 stainless steel shim and wrapped it around the barrel extension to take out any play between it and upper receiver. It was not as tight as a BCM spec upper but it was very tight with no play. I didn't have to use a rubber mallet to get the barrel and upper receiver put together.  I used Loctite 2422 extreme high heat, medium thread locker on the gas block set screws and the hand guard locking block.   The barrel nut, gas block, gas tube and Warcomp installed. I used a neutral timing on the Warcomp.   |
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Posted: 4/14/2020 9:56:42 PM EDT
[#20]
Good tip on the vertical lapping and very nice build @yojimbo.
What site are y’all using to host photos nowadays? |
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Posted: 4/14/2020 10:01:02 PM EDT
[#21]
Quote HistoryQuoted: Good tip on the vertical lapping and very nice build @yojimbo. What site are y’all using to host photos nowadays? Thanks! I am using imgur to host my photos. But my pics are just from my iphone, not the greatest...  Also, my gun work bench is a mess too. 
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Posted: 4/14/2020 11:08:54 PM EDT
[#22]
Quote HistoryQuoted: Anyone have any feedback on the KAK 18” .308 stainless with a rifle length gas? https://i.imgur.com/XAv30kk.jpg Edit: for a real pic hosting site. |
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Posted: 4/15/2020 2:20:55 PM EDT
[#23]
Quote HistoryQuoted: Got my build completed last weekend. I also went with a Magpul RLS sling so I could sling up Rhodesian quick loop style or cinched down 1907 style. https://i.imgur.com/wSnKpFN.jpg Here's a break down of my parts list. Lower Aero M5 Lower Receiver Aero Lower Parts Kit - Trigger Assembly Geissele G2S Trigger BCM A5 Receiver Extension Armalite AR10 EA1095 Recoil Spring BCM H3 Buffer PWS Ratchet QD End Plate Magpul ACS Stock Blueforce Gear ULOOP Magpul K2+ Grip Upper Aero M5 Upper Receiver Aero Upper Parts Kit Raptor LT 7.62 Charging Handle Aero Phosphate Bolt Carrier Criterion Head Spaced Fulton Bolt Criterion 18", Nitrided, Hybrid .308 Barrel Surefire Warcomp 762 SOLGW Low Profile Gas Block Spikes Nitrided Rifle Gas Tube CMT Tactical UPHR 15.0 Mod 2-HP Handguard ADM 20 MOA(6 MIL) Recon Scope Mount Weaver Tactical 3-15X50mm Scope With EMDR Reticle Butler Creek Scope Lens Covers Troy Folding Rear Battle Sight Troy Folding Front Battle Sight Magpul MLOK Bipod Magpul MLOK QD Mount Magpul RLS Sling I hand lapped the upper receiver in the vertical position. I just used hand pressure and the weight of the lapping tool. I feel like it gave me more control than using a drill and only took a couple of minutes longer. I also used .001 stainless steel shim and wrapped it around the barrel extension to take out any play between it and upper receiver. It was not as tight as a BCM spec upper but it was very tight with no play. I didn't have to use a rubber mallet to get the barrel and upper receiver put together. https://i.imgur.com/zcHgNxp.jpg I used Loctite 2422 extreme high heat, medium thread locker on the gas block set screws and the hand guard locking block. https://i.imgur.com/Euq2NVR.jpg https://i.imgur.com/dbqutj5.jpg The barrel nut, gas block, gas tube and Warcomp installed. I used a neutral timing on the Warcomp. https://i.imgur.com/BquQnas.jpg https://i.imgur.com/RIwvGon.jpg Nicely done! |
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Posted: 4/15/2020 2:21:55 PM EDT
[#24]
Anyone with a 6.5 CM got a recommendation for a muzzle device? That’s the last part I need before final assembly.
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Posted: 4/15/2020 3:09:15 PM EDT
[#25]
Quote HistoryQuoted: Anyone with a 6.5 CM got a recommendation for a muzzle device? That’s the last part I need before final assembly. VG6 makes a Gamma that's specific to the 6.5 (.26") caliber. an Epsilon too. If you shop around you can find them at a pretty significant discount, I picked up a few at $50 each last BF. https://www.vg6precision.com/vg6-gamma-65 https://www.vg6precision.com/vg6-epsilon-65 otherwise, most folks use a 308 MD. |
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Posted: 4/15/2020 3:54:28 PM EDT
[#26]
Still need an Optic/mount. Thinking a badger C1 for the mount.
16” criterion 6.5 
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Posted: 4/15/2020 5:30:18 PM EDT
[#27]
Quote HistoryQuoted: Still need an Optic/mount. Thinking a badger C1 for the mount. 16” criterion 6.5 https://i.imgur.com/iDs1Owq.jpg A 16" 6.5 Creedmoor seems like the perfect sleeper rifle for the range. Roll up with a carbine-looking autoloader and then start ringing plates at 1,000. I went with an 18" on my build, but mostly because I wanted the Rifle +1" gas system. |
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Posted: 4/15/2020 7:28:33 PM EDT
[#28]
Quote HistoryQuoted: VG6 makes a Gamma that's specific to the 6.5 (.26") caliber. an Epsilon too. If you shop around you can find them at a pretty significant discount, I picked up a few at $50 each last BF. https://www.vg6precision.com/vg6-gamma-65 https://www.vg6precision.com/vg6-epsilon-65 otherwise, most folks use a 308 MD. Thanks! ETA I just ordered the 6.5 Gamma from Brownells. They are on sale right now. |
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Posted: 4/16/2020 3:36:30 PM EDT
[#29]
Quote HistoryQuoted: Thanks! ETA I just ordered the 6.5 Gamma from Brownells. They are on sale right now. I too would recommend the VG6 Eplison 6.5, running one on my 6.5 creedmoor and 6.5 grendel. Very happy with them. Armorally.com has some good sales on them as well. |
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Posted: 4/16/2020 4:28:36 PM EDT
[#30]
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Posted: 4/16/2020 7:08:31 PM EDT
[#31]
One of five M5 builds. 16" Ballistic Advantage SS barrel, SLR rail and Adjustable gas block, Leupold Mk IV scope, Velocity 3-lb. trigger. Hornady 147 FMJ with 49.0 W-760 (not the best powder for .308 but I have a jug of it) at 100 yards... I'll take it.
 
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Posted: 4/17/2020 8:03:16 AM EDT
[#32]
Quote HistoryQuoted: One of five M5 builds. 16" Ballistic Advantage SS barrel, SLR rail and Adjustable gas block, Leupold Mk IV scope, Velocity 3-lb. trigger. Hornady 147 FMJ with 49.0 W-760 (not the best powder for .308 but I have a jug of it) at 100 yards... I'll take it. https://imagizer.imageshack.com/v2/640x480q90/922/xuTGFQ.jpg https://imagizer.imageshack.com/v2/640x480q90/924/G0pEta.jpg @Bowhntr6pt Looks like a good solid build! What sling are you using? It's hard to tell by looking at the picture. |
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Posted: 4/17/2020 8:33:26 AM EDT
[#33]
I'm still debating on what scope mount to use for my 3-15 PST Gen II
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Posted: 4/17/2020 8:45:40 AM EDT
[#34]
Quote HistoryQuoted: @Bowhntr6pt Looks like a good solid build! What sling are you using? It's hard to tell by looking at the picture. It's a Specter Gear 3-point. I'm going to swap all the ones I have over to MS1 slings eventually and get away from the 3-point design. |
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Posted: 4/20/2020 11:10:56 PM EDT
[#35]
I've been gather parts and pieces to put an Aero based 308 together for a while. Had pretty much put it on the back burner with the craziness and everything being unattainable. The 16" CMV barrels have always been OOS whenever I looked.
I get their emails for sales, etc., but never have the barrel I want. Low and behold, I look at an email from today and damned if that barrel isn't on sale with free shipping. And they still have it. Got one coming. Few more pieces and we're in business. If we use the Aero BCG, does the headspace need to be checked? What about the Toolcraft? |
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Posted: 4/21/2020 12:18:03 PM EDT
[#36]
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Posted: 4/21/2020 12:34:55 PM EDT
[#37]
Waiting on the California Lockdown to end so I can test out my build.
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Posted: 4/21/2020 12:47:05 PM EDT
[#38]
Aero M5 upper and lower
R-one 12" M-LOK handguard Aero M5 upper and lower parts kits Larue MBT2S trigger Criterion 16" chrome lined hybrid contour barrel Vltor RE-10 receiver extension with Armalite AR-10 spring and H3 buffer Chrome plated bolt carrier with DPMS bolt and guts SLR set screw gas block BAD 90 degree selector Radian SL charging handle BCM Mod 1 grip B5 SOPMOD Magpul M-LOK bipod Lancer L7 20 round mag Burris XTRII 1-8 in a Midwest Industries mount I have a Surefire 300 SPS suppressor and usually install their muzzle devices but I put this rifle together for my brother who doesn't own a suppressor. If he backs out on the rifle I have a Surefire Warcomp ready to go. 
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Posted: 4/21/2020 9:20:48 PM EDT
[#39]
Quote HistoryQuoted: I've been gather parts and pieces to put an Aero based 308 together for a while. Had pretty much put it on the back burner with the craziness and everything being unattainable. The 16" CMV barrels have always been OOS whenever I looked. I get their emails for sales, etc., but never have the barrel I want. Low and behold, I look at an email from today and damned if that barrel isn't on sale with free shipping. And they still have it. Got one coming. Few more pieces and we're in business. If we use the Aero BCG, does the headspace need to be checked? What about the Toolcraft? I started at the opposite end. I grabbed the 18 SS last night as the 1st part of a build. Now to find good prices on the rest of the parts. |
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Posted: 4/22/2020 10:08:43 PM EDT
[#40]
Quote HistoryQuoted: I started at the opposite end. I grabbed the 18 SS last night as the 1st part of a build. Now to find good prices on the rest of the parts. Sales. I have most everything and it's all been bought while on some kind of deal. Either at Brownells or Aero. |
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Posted: 4/22/2020 10:18:57 PM EDT
[#41]
Took spray paint to it, looks way darker than it is. Crappy phone pic, magazines are a better representation of the colors
 
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Posted: 4/24/2020 12:38:46 PM EDT
[#42]
First time I've put together a large frame, done plenty of small ones. It's funny, I bought this Mega wedge lock handguard by accident when they were starting to get scarce thinking I was buying a small frame size because I didn't read closely enough, I was just trying to get my hands on a 7075-T6 handguard before they were gone. So it sat in the box collecting dust until I remembered I had it while building this. Drilled the Aero upper with a little pin hole and it came out perfect. This handguard isn't moving for anything short of a big hammer, and you better eat your Wheaties first.
My normal range has been closed for months now so I'm trying to find another option to get it out and break it in. 
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Posted: 4/25/2020 3:54:12 PM EDT
[#43]
What are some good charging handles? I have a crappy Aero standard one.
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Posted: 4/25/2020 4:18:36 PM EDT
[#44]
Quote HistoryQuoted: What are some good charging handles? I have a crappy Aero standard one. Radian Raptor fits perfectly on mine. It's my go-to for AR15's so it made sense for this. |
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Posted: 4/25/2020 5:18:45 PM EDT
[#45]
Quote HistoryQuoted: Radian Raptor fits perfectly on mine. It's my go-to for AR15's so it made sense for this. Quote HistoryQuoted: Quoted: What are some good charging handles? I have a crappy Aero standard one. Radian Raptor fits perfectly on mine. It's my go-to for AR15's so it made sense for this. Yeah it was on the top of the list. |
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Posted: 4/26/2020 7:31:29 PM EDT
[#46]
Anyone have success with the KAC URX II?
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Posted: 4/26/2020 10:09:47 PM EDT
[#47]
Quote HistoryQuoted: Anyone have success with the KAC URX II? I’d say go for it. M110 clone I’m currently going for a m110k1ish |
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Posted: 4/27/2020 5:50:38 PM EDT
[#48]
 Attached File*SBA4 & vfg are for CT compliance Made this one up with the following parts: *2A armament lightweight castle nut, qd endplate magazine catch *Odin xmr3 release *Armaspec stealth buffer *Hiperfire 24E *Radian Talon *Magpul K2+ *Aero bolt catch and TD pins...Vseven titanium pins did not fit to my liking. *M5E1 w/ 15" gen2 Mlok rail *Ballistic Advantage 20" 6.5cm fluted premium barrel w/aero gas block & stainless rifle length tube *VG6 Epsilon 65 bbss brake *Toolcraft 6.5cm DLC double ejector bcg *Radian raptor *LaRue LT104 & vortex Viper PST 4-16x50FFP EBR-1 *Magpul sling mount bipod |
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Posted: 4/28/2020 3:54:16 PM EDT
[#49]
Quote HistoryQuoted: I’d say go for it. M110 clone I’m currently going for a m110k1ish Quote HistoryQuoted: Quoted: Anyone have success with the KAC URX II? I’d say go for it. M110 clone I’m currently going for a m110k1ish Yeah that's kind of what I'm going for. MLOK just doesn't look right to me lol |
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Posted: 4/28/2020 6:22:10 PM EDT
[#50]
Welp. Not really sure wtf is up with my rig but the 22" Criterion SBN from Brownells doesn't seem to want to shoot. 143 ELD handloads, American Gunner, and S&B Match all were 2+ MOA. bout 150 or so rounds down the barrel, it should be fairly settled.
Aero mount, G1 PST 6-24, G2S-E. Everything's tight and torqued properly. it's the same with or without the muzzle brake/can mount, and with or without the can. Harumph. I don't wanna think Criterion put out a sub-par barrel, but I also was putting several handloads (53ELD-M over Varget, 75BTHP over TAC, 73ELD over 8208XBR) into 10-round sub-moa groups through my white oak varmint barreled small-frame build, so I'm fairly certain it wasn't me either.
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