dubya

Very informative. I was thinking along the same lines as Alan while reading the first page, I'm glad that was explained better. Now what do you do if you have short headspace, other than reaming out the chamber? My 308 Rainier Match barrel is a hair short, wont quite close on a 1.630 Clymer GO guage but chambers multiple different 168gr 308 rounds showing Sharpie marker wear on the ogive from touching the lands but nothing I can feel with my fingernail on the bullet itself.

Yes, I believe that may be. This is my response in a similar thread I have going on the other forum. So this is kind of interesting. I went shooting on Sunday and didnt bring my new 308 because my buddy said the 224 Valkyrie upper I built for him was having all sorts of feeding and extraction issues and I wanted to get that running for him (I cleaned the chamber and lubed the BCG and it ran perfect ). One of the other guns my friend brought was his somewhat new 18" PSA PA10 308. We put about 120 rounds of factory fresh Federal 308 ammo through it, on top of the 40 he shot in that gun previously. It ran nearly perfect with surprisingly decent accuracy. The only malfunctions were a spent case not being ejected quick enough before the next round tried to feed, that happened twice. I didn't notice any over pressure signs or blown primers in the spent brass, although I didn't check every single case either. When we left he asked if I would store the rifles he brought until he and his family closed on their new house and settled in. No problem. Once I was home I took both mine and his ARs apart to clean and decided to check the headspace of his PA10 as well as my 308 with his bolt. His PSA BCG is nearly identical to my Toolcraft BCG. The only difference between the bolts and carriers is mine (Toolcraft) has a O-ring extractor and his (unbranded PSA) doesn't. Using his bolt in my gun I could get it to close more than my bolt on the GO guage but still not fully. Then, I checked the headspace of his factory assembled PA10 upper with both his bolt and mine. Both failed to close on the GO guage. I'm not exactly sure what to take away from this but his PA10 now has nearly 200 rounds of 308 through it and it failed a 1.630 GO guage. I'm going to shoot mine the next time we hit the range.

They use PTG guages

I did email Rainier a few days ago but haven't gotten a response yet. Since I cant sleep tonight I decided to see if a spent 308 case would chamber. I tried a couple I randomly picked out of a bag of brass I've been saving and they could have been shot out of my old PA10 or one of my buddies 308s. Either way, none would chamber. My forward assist doesnt work in the M5 upper so I also tried letting the bolt slam home, it still didnt chamber and I had to mortar it out. Guess I'll be giving Rainier a call on Monday. The gun chambers factory 308 ammo but fails on a Clymer 1.630 GO guage. Now I wish I had bought the Faxon pencil barrel like I originally planned.

Well, there's no sending this one back. I already cerakoted the barrel black

This is my thread regarding the headspace of my 308 on ARFCOM if anyone cares to check it out. https://www.ar15.com/forums/AR-15/What-if-my-headspace-is-off-/121-738596/

It's a Rainier Arms Match barrel and it has a modified 308 chamber proprietary to Rainier. From my understanding its similar to 223 Wylde, it's not 308 or 762 NATO but is supposed to shoot either. The ammo is brand new factory 308 ammo

The gun is all assembled, just needs an optic now. I think.... I borrowed a set of Clymer 308 Match headspace guages 1.630 GO & 1.634 NO GO. Stripped the bolt and the NO GO doesn't chamber, great. Try the GO guage and it also doesnt chamber but the bolt does turn a bit, just not enough to lock. I painted two different factory 308 rounds with a sharpie. First was Hornady Black 168gr Amax and the other was Norma Match 168gr SMK. Both chamber just fine but extraction is a tad sticky with the Hornady (no mortaring or anything). The bullets look to be touching the lands just the slightest bit, it removed the sharpie lightly but there isnt anything I can feel with my fingernail on the bullet. I chambered these rounds with the mag inserted and letting the BCG slam home. This is a Rainier Arms Match barrel and Toolcraft 308 Nitride BCG. Apparently Rainier has a modified 308 chamber. Would I be pushing my luck if I went ahead and fired this gun? I've recently talked to a member on ARFCOM that is experiencing nearly the exact same thing i am with his new 308 build using a Rainier barrel.

If you look at a picture of the LMT 308 CH it has these two "ears" that stick down from the bottom of the handle. The ears hit the receiver and stops the CH from fully closing. At first I hand filed until it worked but it looked crappy so I sanded it smooth on my belt sander, refinished the bottom with black ceramic paint and all is good now. It essentially looks like a standard charging handle with an extended latch now

Just a heads up to anyone considering the LMT charging handle. It does NOT work with DPMS pattern receiver sets without modification. I got mine to work but it took the work of a belt sander and can of cerakote to fix.

Yeah, I wouldn't put any heavier grease like that in for lube, especially on a new build that needs breaking in. Clean that stuff out and run it wet with a good oil.

http://i.imgur.com/EXjEPZf.jpg

Aero just had the M5E1 builders set which included the upper, lower and a Quantum handguard on sale for $299. If you are a first time buyer from their site there is a coupon to take an additional 10% off your entire order and I believe free shipping. I think it's out of stock now though.

I sold it for $90 on ARFCOM after 30rds and plenty of dry fire. My buddy will probably sell his though when the next Geissele sale hits, I think they might have one for Easter.

Long story short, it feels like the rest of my triggers. It has a nice break (for the price) and a great reset and they can be bought for $100 during one of the many Geissele or Brownells sales every year. I've now swapped out all of my triggers to the GS2 except for my most recent build, a 308, that got a SSA-E. I can definitely tell the difference in the SSA-E but I dont think it's worth the extra cost over the G2S, for my use anyway.

To start with, I absolutely hated the reset with the factory installed spring. It was very weak and I practically had to take my finger off to reset, I wasnt able to ride it like I'm used to with my other AR triggers. Installing the heavier spring fixed this problem but it also caused the break to go from something similar to an SSA-E to a SSA feel, maybe a bit heavier. And I installed it properly with the grease as suggested in the instructions. I've only shot two MBTs, including mine, but both had this issue. I started off actually kind of liking the wide shoe but after going back and forth between ARs at the range, I decided I didn't like having one gun with a wide, flat trigger shor while my others were "normal". I wanted them to all feel similar. That's just personal preference. I understand why LaRue can keep the price down on these and part of it is because there is less machining done on these triggers as some others, I think the MBT would feel alot better with some rounding or blending of the edges. Again, personal preference. I also found it odd that while the MBT is supposed to be made in house in Texas both mine and my buddies (two separate orders a few weeks apart) shipped directly from Colorado when I checked the tracking. I've talked to a few others on ARFCOM and have heard some being shipped from CO and some from TX.

I guess I'm the only one here that truly did not like my MBT for a couple reasons. I much prefer the G2S for a budget trigger @ $100 on sale.

Doesn't the Savage MSR10 come with a pretty decent Blackhawk Blaze 2 stage trigger? My buddies MSR10 did but it might be a slightly different model.

Now everything is ordered, just waiting on the Surefire Eliminator 3 prong, Armaspec SRS buffer system and the Aero M5 builders kit. Aero sent me a tracking number on Friday the 8th and it's been in limbo ever since just saying "shipment information sent to FedEx". I called Aero today to find out what the heck is going on and the lady politely told me they shipped the order on the 8th. I explained that my FFL hasn't gotten anything and the tracking shows it wasnt actually shipped, just a label was created. After a 15 minute hold she basically said the package either isnt getting scanned and it's in transit, or its lost and I'll have to file a claim. What a crock! I've had amazing CS experiences with Aero in the past but I'm not going to be happy if I have to file this claim myself and wait who knows how long to get the parts I just paid almost $550 for. She said she will call me back tomorrow hopefully.

A member on ARFCOM confirmed the LMT will work in the Aero M5. I'm pretty happy considering it was $40 less than just about all the other extended latch charging handles and coming from LMT I wont have to worry about quality.

Thank you, I'll order one today. Has anyone used the Armaspec Stealth Recoil Spring 308 (JP SCS copy)? I believe it's a 5.7oz buffer and dual spring system. Its about the same price as the KAK Shorty buffer and orange Sprinco cost but it says up to 15 days until it ships. I think I'm going to order one to try and see what works better in my setup, I can probably sell the buffer system I don't use to one of my buddies that both have overgassed PA10s

I've never seen a 308 charging handle listed as "DPMS pattern" or "Armalite pattern", is there actually any difference in them? I ask because I have a Aero M5E1 build I just ordered most of the parts for. The charging handle is a LMT LM308CA, basically just an extended latch CH that is made from a company I trust and it was also only $50. On another forum I'm on it seems like nobody is too sure if there's any difference in 308 CHs. If all else fails I will find out first hand later this week when parts arrive.

What BCG would you guys suggest? Besides the scope, the BCG and Warcomp are all that's left to order now. The Brownells BCG is on sale for $129 right now but has some questionable reviews. So far I've ordered: *Aero M5E1 builders set w 15/Mlok rail & LPK *Rainier Arms 16" Match lightweight intermediate barrel w/gas tube & Daniel Defense clamp on gas block *Geissele SSA-E FCG *LMT Extended latch 308 charging handle *BCM carbine buffer tube, QD end plate and castle nut w/Magpul grip & stock *KAK Shorty buffer (2.5"/5.3oz) & Sprinco Extra Power orange spring