D.R.D.

Blacksheep: This is the one I was thinking about: https://www.primaryarms.com/American-Defense-AD-SCOUT-30MM-p/ad-scout-30.htm Same thing with only one QD lever, no? Anyone know the weight on the 14" & 15" models, and the interior clearance height for the gas block on this: http://www.jdmachinetech.com/product/308RL/308CHG.html shibiwan: That gas block is perfect! Thank you! I saw these two are similar. Any pros or cons for either: http://www.precisionreflex.com/Detail.aspx?PROD=186679&TERM=gas%20block http://shopwilsoncombat.com/Adjustable-Lo-Profile-Gas-Block-937-Rifle-Length-Straight-Gas-Tube/productinfo/TR-AGBL-R/ The PRI doesn't have the height - it only says that it might not fit under some handguards. I think the Troy Battlerail is 1.61" of space inside. Thanks for the explanation - very clear. The Fulton barrels look nice...and pricey. Any other input on Bull vs. standard profiles (other than weight...I don't plan on clearing rooms with this rifle. I have other platforms home defense) From what I;ve read performance drops off more significantly after 20", but my question is less than 7" enough dwell time to ensure consistent functioning if you went below 20" with a rifle-length gas-system? DRD

Wow, thanks for all the replies and info, all! Just to be clear, will this SWFA scope http://swfa.com/SWFA...ope-P62238.aspx work with this ADCO mount http://www.americandefensemanufacturing.com/view/product/25/ ? I understand your points of 20MOA and saving money. However, I thought that if I can, I'd start with this. Then, if I decided to upgrade, I'd get a different./ larger mag. scope with it's own dedicated mount and switch them out easily without losing zero since the ADCO is a quick detach design. How did you get your dope on the stock like that? What is it printed on? Very cool. Also, what kind of barrel is that? (length, contour, weight) You mentioned over-gassed rifles. What does that mean exactly? I'm still trying to understand more about the relationships between the gas-system length, Adjustable gas-blocks, BCG weight, and Buffer mechanisms. I get the general idea, but really want to try and "buy once" and get it right the first time. I'd rather shell out a little more for the best combo/quality on the main operational pieces than fill a box of parts I no longer use (like I have for handguns - LOL!) So what do you think about this combination: 20" barrel http://www.blackholeweaponry.com/catalog/product_info.php?cPath=48&products_id=100&osCsid=ae7feedabb2512f1ba1b04043d3769e2 Heavy buffer http://heavybuffers.com/ar10rifle.html SI Defense BCG http://si-defense.mybigcommerce.com/308-phosphate-bolt-carrier-group/ Gas block (one of these) http://bte-usa.com/parts/AR15-gas-blocks.htm or http://www.jprifles.com/1.4.6_gs.php to fit under this: http://troyind.com/%20/anew-products/troy-battlerail-trx-308-13-8 Also, any feelings about the pros and cons of standard vs bull-barrel contours for precision work? My understanding is that while heavier, the bbl will last longer, vibrate slightly less, and heat up slower, which sounds like a good idea for a semi-auto that moves more than a bolt and can fire in quicker succession. In a polygonal contour, a 20" should gain velocities of a barrel slightly longer, and be easier to clean. My goals here again are reliability, accuracy at a distance, and potential exposure to harsh environments. Thanks again for all your help - this forum is an amazing resource! DRD

shibiwan, Thanks for the welcome and all the advice! I've got a few follow up questions based on what you wrote: 1. Does the Atlas have a swivel or cant feature? 2. When you recommend heavy buffers, do you mean this: http://heavybuffers.com/ar10rifle.html I've heard so many people talk about "low-mass" or various sizes to fit different stocks. My concern, as I had written is reliability and controlability. I'd also heard that a heavy buffer is used more in a carbine length gas system, and will slam the action more than necessary in a rifle length, only contributing to more recoil and wear on the rifle. I'm quite confused here. What am I not understanding? 3. This is the optic I'm considering: http://swfa.com/SWFA-SS-3-15x42-Tactical-Rifle-Scope-P62238.aspx Will I need a 20MOA base for this? If so, why? Do you have any recommendations? (best quality for the lowest price preferred) Thanks again! DRD

I'm building my first .308AR. It's use will be for longer-range precision work. My choices are influenced by Crusader Weaponry's builds and By LaRue's PredatOBR It's pretty straight-forward. My question and concerns are in Bold/Italics Thanks in advance for any help that will have me get it right the first time and avoid expensive mistakes! Here are my current specs (so far, I only have the Receiver) Receiver Set: SI Defense Barrel: 20" Black Hole Weaponry heavy barrel (.936) with rifle length gas system Muzzle device: R&D MRAD removable (so I can shoot f-class, with a can, of with a brake) Anyone have experience with these or with Badger Ordinace's FTE / FTE Micro? Gas block: BTE or JP low-profile Adjustable (Will these fit under the Troy Battlerail? If not, what lighter full-length rail will work?) Handguard: 13" Troy TRX-Battlerail Buffer tube: DPMS rifle length stamdard Buffer & Spring: DPMS standard A1/2 rifle buffer & spring (with permanent Slip-Stream Treatment by Crusader Weaponry) Any reason why I should choose another Buffer? (Like a low mass, heavy buffer, etc.) I'm looking for reliability & smooth precision shooting. Bolt Carrier Assembly w/ Bolt: Si-Defense Phosphate (with permanent Slip-Stream Treatment by Crusader Weaponry) Any reason why I should choose another BCG? (Like a low mass) I'm looking for reliability & smooth precision shooting. Stock: Magpul PRS Grip: Large-Frame Ergo or BCM Gunfighter Mod 1 or 0 Trigger: Geissele SSA-E (Any better suggestions?) Charging handle: PRI Gas Buster (with permanent Slip-Stream Treatment by Crusader Weaponry) Lower / Upper parts kits: ADCO / DPMS (Any concerns here?) Bipod & optics mounts: ADCO Scout Bipod: Harris or Atlas (suggestions?) Cheers, DRD