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Posted: 6/12/2016 5:16:59 PM EDT
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Ok guys, I'm getting ready to start my MATEN build in 308. I currently have a matched MATEN Megalithic receiver set. Between working a ton and the other struggles of life I haven't had as much time to research this project as much as I'd like...so I'm reaching out to people with hands on experience with the MATEN who would be kind enough to lend suggestions. Prices on the components are not an issue, however, I don't want to go way over the threshold of diminishing returns. I will be occasionally running a Silencerco Hybrid suppressor. My main desire is reliability, then accuracy while keeping it as light as I realistically can. I want to keep the barrel length at 16" to help with the weight and maneuverability. Some of the components I've been toying with, but undecided on are:
Barrel: JP Supermatch with matched high pressure enhanced bolt. Also looking at the Rainier Ultramatch. Open to other suggestions as well as 1st hand experience with the 2 mentioned. BCG: Looked at the LMT bcg, Lantac bcg, and the JP full mass QPQ treated bcg because I figure it should pair nicely with the JP barrel and bolt. Really leaning on a full mass bcg to squeeze every bit of reliability out that I can get. I have no 1st hand experience with a low mass carrier but from what I've read more mass helps with slamming back into battery if it's dirty. Any experience or recommendations on these or others? Gas block: the gas block will be adjustable. I have a Syrac ordinance gen2 on an AR15 build and I like it. Also open to the Sentry gas block. Not sure on gens or updates to either of these. Muzzle device: This will be from Silencerco but haven't decided on the brake or flash hider for mounting the suppressor. The rest (buffer, spring, stock, lpk, ect.) is all up for discussion. As far as the trigger goes I'm looking at CMC's 3.5lb single stage but that's not set in stone. All the help I can get is greatly appreciated! |
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Okay, there's a lot of guys with more accurate build than me. Statistically, my MATEN is about a 1.1 MOA gun at 100. Largely.....most of that error is due to ME...not the build. There are some things such as shimming the extension of the barrel, etc, that you can do to really bring an AR-10 type gun into its' own. Handloading is a big one....that being said, I shot a 1 inch group with PMC 147 grain boat tails and that is about as plain Jane factory as you can get.... As far as gas blocks go, the key is just buy GOOD. So, Syrac, SLR Senty, Odin Works....etc. I am running the 22 inch JP medium contour, super match barrel with matching bolt and it has been AWESOME. Their cold shot claims ring true. Now, in this gun I have a CMMG carrier....but my Carbine is the one with the full mass JP carrier. That JP carrier is AWESOME. I wish those were out when I build the bench gun. Your grip and trigger interface will also be important.....I love Geissele triggers so they are my personal choice. Grips are very personal.....so that will require some research. By the way....Slash's heavy buffers in combination with a good adjustable gas system....pure win!!!! I have a Slash buffer in my carbine and now want one in my bench gun. Handguard....whew....I am undecided. The JP is really good but rather complicated.....I have an APEX on my carbine and really like that. The vote for solid feel seems to go to Geissele largely, I think, due to the available surface area on their barrel nut. BTW: here is my Mega Target:  If I may....unless you plan on using a night vision adapter.....forgo a full length top rail. They are pointless IMO....BUT, a two inch rail for a BUIS is not a bad idea. |
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I call it CeraKote shimming. Take a look about halfway down page 3 of this post and you'll see jonblack's EXCELLENT example. http://www.ar15.com/forums/t_3_121/693671_Getting_ready_to_build_a_6_5_Grendel_upper___Come_on_my_journey_with_me_.html&page=3 |
Here is my build. Its changed alittle since this pic but nothing major.
POF build kit (upper/lower/14.5 rail) JP 22" supermatch barrel / matching bolt / adj gas block JP full mass carrier JP silent capture spring (gen 2 heavy buffer) JP Thermal dissipation (not in pic) geissele trigger -HSNM SiCo brake (saker 762 on it) Its prob tied for my favorite rifle. this one shoots SSOOO smooth and its unbelievably accurate. I was torn with the Rainer and JP but i shot a JP once and thought i was a great gun. had no experience with the Rainer, so i went with JP. As you can see, its pretty much a JP rifle inside a POF body. Defiantly make sure the barrel to upper fits tight. shim if u must, not that hard. there was just barely some movement for my combo, so between heading up the receiver and blue loctite on the barrel, it was gtg No matter what route you go, hand loading will get you better results (and save you $) over even the nicest factory stuff If i was ever going to change 1 thing, it would be the adj gas block. not that there isnt anything bad with the JP, but i really like the POF one as fas as ease to change settings. BUT...saying that, the JP i set it once when i didnt have a silencer, now i have the saker, i set it again and havent touched it for a year. the recoil is none existent. everyone that shoots it complements it and cant believe its a 308. |
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Quoted:
I have an MDT butt pad on mine and I can literally shoot my gun all day and not even feel it when I get home. I really like that. Quoted:
Quoted:
the recoil is none existent. everyone that shoots it complements it and cant believe its a 308. I have an MDT butt pad on mine and I can literally shoot my gun all day and not even feel it when I get home. I really like that. this 1 has the magpul extended butt pad. i do alot of benchrest type shooting with this 308 so a "busy" day for me is 50-60 rounds so not like its much, but compared to other 308s ive shot, this is nothing. |
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Here is my Mega Maten. Geissele HS National Match DMR trigger JP Lo Mos BCG JP High pressure bolt JP AR-10 SCS spring Mega 16" barrel Weight: ~14 lbs loaded iirc Be aware the JP bolt will close on a no-go gauge. They make the bolt face set back .002" for some reason. The response I got was "it's fine as long as it doesn't close on the field gauge." Maybe that is an extra reason to go with the JP barrel, since the bolt and barrel are matched to each other. 
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Quoted: Here is my Mega Maten. Geissele HS National Match DMR trigger JP Lo Mos BCG JP High pressure bolt JP AR-10 SCS spring Mega 16" barrel Weight: ~14 lbs loaded iirc Be aware the JP bolt will close on a no-go gauge. They make the bolt face set back .002" for some reason. The response I got was "it's fine as long as it doesn't close on the field gauge." Maybe that is an extra reason to go with the JP barrel, since the bolt and barrel are matched to each other. http://i177.photobucket.com/albums/w225/innocentdevil1/ARFCOM/1622449e-fb51-4e05-8807-069eac0662d6_zpssyflarog.jpg     |
| I'm planning on going with an adjustable gas block (Syrac or SLR Sentry) are there any issues with the JP LMOS bcg when it gets a little dirty or in adverse conditions? I don't clean after every range trip...generally every 1k rounds or so. Would love some 1st hand knowledge on it. |
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Quoted: I'm planning on going with an adjustable gas block (Syrac or SLR Sentry) are there any issues with the JP LMOS bcg when it gets a little dirty or in adverse conditions? I don't clean after every range trip...generally every 1k rounds or so. Would love some 1st hand knowledge on it. Personally, I haven't had any issues. I would think that it wouldn't matter much if you had a standard or LMOS BCG if you were using an adjustable gas block; either way you would be controlling the speed of the reciprocating mass (BCG). The full weight BCG would probably give you slower unlock times (akin to how a h2-3 buffer would work), which would be better for extraction. Correct me if I'm wrong. The LOMOS will allow you to run at the bleeding edge of efficiency if you want; with lower reciprocating mass and less effect when it bottoms out in the buffer tube. Adjusting the gas block to take advantage of this (to just barely kiss the end of the buffer tube) will substantially reduce the "reliability" of the system, but will make the gun extremely light shooting. It's been a while, but I think both Syrac and SLR both suggest opening up an extra click or two after you have found the "sweet spot" to guarantee reliability with a variety of loads. As for my experience, I have never had my BCG very dirty. I have only gone about 500 rounds between cleanings. It has never seen dusty conditions, nor has it been submerged in mud or anything of that nature. I use TW25b on all the bearing surfaces and have not had any short stroking problems due to my gas block adjustment or carrier weight. Disclaimer: my Ranier Raptor has came loose several times due to weak springs (known issue), which caused a failure to lock back on the last round on a few occasions. As a side note, factory .308 ammo seems to run on the hot side for gas guns. Going with an adjustable gas block is the best choice to reduce recoil imo. |
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