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Thanks for the insight Robocop1051. That combo of the Magpul MIAD and Exile Machine back fin looks modular enough to strongly consider. The sparrowdynamic and thordsencustom stock adapter are functional but not ergonomically nor aesthetically compatible. It would appear that the part where the web of our thumb would meet the grip is jagged at best. I can add a photo later, don’t want to wake the wife in the mid of the night taking pictures of my gun. The Smoke Composite did come with a sling attachment option on their closed design but I opted for the open design. I understood my rifle would be a bit front heavy when building it due to the barrel. I never really use the telescoping feature of the stocks in service, didnt see the need for one pinned nor unpinned. Plus, part of the decision was for a “skeletonized” stock to accomodate the sparrowdynamic style grip. To be honest, part of the decision for a proofresearch barrel and smokedcomposite stock was aesthetics. The carbonfiber, minimal appearance matching was nice. Chose the more expensive and reknowned barrel brand over the other options of carbonfiber. i do entirely plan on making the featureless aspect modular, by getting the carbonfiber grip from VenomDefense for out of state use. Have also been toying with idea of using the takedown pin function for mag swaps to make it compliant with the standard pistol grip—but I dont know if that works on a .308.

Hello, I know I probably triggered many people by mentioning my home state of CA. As much as I dislike not being able to have a pistol grip or suppressor (for ergonomic reasons,) building my AR10 in California has caused me to tap into a creative side I haven't needed since childhood. Not to mention, in scouring the internet for CA compliant components I have actually made accidental discoveries for other parts that I otherwise would've never found. The result is that my custom build won't be a clone of every other trending build out there on social media (hopefully.) My goals are simple: 1) creating a CA compliant AR10 without making it a functionally different machine. (e.g. avoiding safety selector on the other side or a fixed magazine) 2) building a lightweight AR10 using Carbonfiber and/or Titanium where applicable. 3) future compatibility if I ever move out of state, or CA realizes how ridiculous its gun laws are. (or if they decide military/law enforcement should be able to have these features.) 4) Quality Thus far I have started off with a stripped AeroPrecision M5 receiver: 1) For CA compliance I have the SparrowDynamic grip, OdinWorks extended mag release, ResurgentArms extended safety selector. The last part I need for my CA compliant grip is the FRS-15 .308 stock adapter from ThordsenCustoms. 2) For lightweight thus far I have the SmokedComposite open stock and BrigandArms 9" blade handguard. In plan on purchasing a ProofResearch 16" carbonfiber barrel, and an SLR titanium gas block. All other small parts will mostly come from VictorySeven, 2AArms, NorthtechDefense or BadgerOrdnance in titanium. 3) For compatibility I have the JP high pressure enhance bolt and firing pin (ProofResearch head-spaced), and the Radian raptor-sd charging handle (for suppressed). I plan on purchasing a JP silent buffer spring set. 4) For quality, I have a Geissele dynamic combat trigger. I plan on purchasing a Leupold sight--still debating if I should get red-dot for quality-quality or the deltapoint pro for quality-lightweight. These are all my short term goals. Long term goals include BUIS, Leupold D-Evo, Surefire light, PrecisionArmament M4-72 muzzle brake and eventually a second upper with a long barrel. I am open to all recommendations and suggestions. EDIT - I keep misspelling SparrowDynamic!!!

DuckDuckGo search for .308 specific parts for my build. Stumbled upon plenty of AR15 forums in the past with not enough insight to the .308 and now have found something that fits the bill for my AR10.