These days everyone builds their own AR and for good reason…its a ton of fun, can save you money and gives you good knowledge of how an AR works. One issue that many AR builders run into is finding compatibility issues with the parts they bought. With the popularity of ultra low profile handguards one of the most common issues is gas block incompatibility. Many handguards are so low profile that they can actually come in contact with the gas block itself or accessories attached to the handguard. I recently ran into this issue myself and figured I would share my experience with you.
One of my most recent builds is a DMR style rifle with a BSF Barrels 16″ barrel with a Carbon Fiber Shroud. Because of the carbon fiber shroud (designed to strengthen the barrel, reduce weight and help it vent heat) the gas block seat is .936″ so of course I just ordered any old .936″ low pro gas block.
Everything installed just fine, I slid the Cross Machine Tool UHPR Mod 2 handguard over the barrel, tightened it all down and … DUN DUN DUUUUN … the gas block was touching the bottom of the handguard. Not just close, literally touching. That’s called “unfreefloating” your barrel. 😂😂 This is something I verify every time I build a rifle as I’ve also seen MLOK screws touching gas blocks as well. Anything coming in contact with the gas block / barrel can and will effect accuracy even at just 100 yards.
In a basic beater build you might not care but in a build like this where accuracy is the goal, you have no other choice than to either swap out the gas block or swap out the handguard. Easiest and cheapest is to swap the gas block. Thankfully Cross Machine Tool has just released their new line of J.A.G. (Just A GasBlock) gas blocks which includes a .936 Gas Block specifically designed to fit under their UHPR handguards and many other super low profile handguards.
**One of the only things I actually do like about .936 gas block seats is that the .936″ opening of the gas block is usually big enough to remove without taking off the muzzle device**
While I had the gas block off I also decided to put a second dimple on the barrel so that the second set screw of the gas block would screw all the way in instead of sticking out just to make sure there was adequate clearance.
At this point it was time to reinstall the CMT handguard and check to see how it fit. Flipped it over and definitely good to go! The new Cross Machine Tool JAG .936 Gas Block did the trick and my barrel is now truly Free Floating.
Only thing left to do now is get this blaster to the range. I’ll have a full review of the BSF Barrels 16″ barrel coming soon. If you’re looking for an affordable low profile gas block you can’t go wrong with the new Cross Machine Tool JAG Gas Blocks.
Battle Arms Development makes some of the best AR-15 components out there so their AR-15 Father’s Day Sale is a welcome sight. Now through Monday, June 19th, purchase the Battle Arms Development VERT PDW stock and get a BAD-ASS ambi safety for free. Not to mention I also noticed the VERT PDW was on sale too. Click on the image below for a high res version and read the terms of the sale then head on over to www.BattleArmsDevelopment.com to get your new stock and ambi safety.
AERO Precision will be having a Father’s Day AR-15 Sale. On Father’s Day Only, use the discount code “BESTDADEVER” at checkout to save 10% off your order. You know you want some. Get it at www.AEROPrecisionUSA.com.
Ballistic Advantage is offering 15% off select items for their AR-15 Father’s Day Sale. Check out the full 3 pages of Barrels, BCGs and Receivers on sale now at www.BallisticAdvantage.com.
Tyrant Designs knows that all Dad’s need to have a good grip on any situation 😉 so they are offering FREE SHIPPING on all of their AR-15 Grips for Father’s Day. Head on over to www.TyrantCNC.com to order yours.
Faxon Firearms AR-15 Father’s Day Sale
10% Off Site Wide*
(Discount Applied In Cart)
*Does not apply to Dist/OEM tier
*Applies only to in stock items
Chase Tactical AR-15 Father’s Day Sale
Coupon Code DADROCKS
Sale runs through 6/19
Arisaka Defense AR-15 Father’s Day Sale
As fathers ourselves, we expect to spend this weekend kicking it back and enjoying time with our families, the great outdoors, and even a little shooting. We hope all of you get to do the same!
From today through June 19 take advantage of the following discount codes*
DADSROCK – 10% off the entire Arisaka site
SUREFIRE – 15% off all surefire products
MOUNTUP – 20% off all mounts & control accessories
*Coupon codes do not stack
The GEMTECH Silencer AR-15 Father’s Day Sale starts now! Get 25% OFF .22LR Subsonic Ammo & 20% OFF Men’s apparel. I know I personally love the GEMTECH .22LR Subsonic Ammo so if anyone wants to buy some for me I won’t complain. 😉 Head on over to www.GEMTECH.com to get in on these deals.
Have you heard of Bootleg Builder Inc? You may not know who they are but I know you’ve seen their parts!! Bootleg Builder is a sister company to Primary Weapons Systems offering DI (Direct Impingement) models of many PWS components such as upper receivers, handguards, low profile gas block, charging handle, adjustable BCG, etc. Right now they are having a SUMMER SALE! All you need to do is head on over to their website and use the discount code SUMMER to get $50 off your purchase of $369.99 or more!
15% Off Surefire Products, 10% Off Site-Wide at www.ArisakaDefense.com
Use code “SUREFIRE” for 15% off all Surefire products.
Use code “MEMORIAL” for 10% off everything else.
Discount codes are valid May 25-31 and do not stack.
BATTLEARMS’ Memorial Day Weekend SALE IS ON!!!
– Spend $100** and get a FREE BAD-ATG Adjustable Tactical Grip (Black)
– Spend $150** and get a FREE BAD-EPS Enhanced Pin Set
– Get a FREE BAD-ASS Ambidextrous Safety Selector Kit – When you buy the BAD556-LW Lightweight 7075-T6 Billet Receiver Set OR the BAD-CSS VERT PDW Stock System.
“Terms: *Each offer cannot be combined and items are > not < stackable!** One promotional item per qualified purchase. While supplies last! Promotional free items will be automatically added to your order if you qualify. >>> DO NOT ADD FREE ITEM TO THE SHOPPING CART! <<< **Total amount of required purchase must be met (not including shipping, insurance and tax). If free promo item is placed in shopping cart, we will assume you want to purchase that item. Value of free item does not count towards the total. ***This promotion is valid only for purchases from May 25th 10am PST until May 30th, 2017 at 11:59pm PST. **NO EXCEPTIONS** ***NO SUBSTITUTIONS OR UPGRADES***. Happy Shopping!”
🇺🇸 Phase 5 Memorial Day Sale 🇺🇸
10% Off Plus FREE Shipping
No Coupon Code Needed
Good through Monday 5/30/17
Check out the San Tan Tactical Memorial Day Sale. Now through 5-30-2017, save 15% off of anything on their entire website using the discount code “MEMORIALDAY” at checkout. This is a great opportunity to save some $$ on one of the best ambi billet lowers on the market.
Get in on the sale at www.SanTanTactical.com.
The AERO Precision Memorial Day Sale is live!
SAVE 15% sitewide + receive FREE SHIPPING on all orders.
Shop the sale – https://aeroprecisionusa.com/store-home/
“As we approach Memorial Day, it’s good to remember what this time is truly about. This weekend we make a concerted effort to reflect on the lives of our service men and women who have passed while serving our country. We celebrate their legacy, and recognize the freedoms that their sacrifices have afforded all citizens of the United States of America. Enjoy savings site wide while joining us in honoring their service and sacrifice.”