Free Shipping & Free Returns*

FREE SHIPPING on Over 250,000 Products

Shop now and get Free Value Shipping on most orders over $49 to the contiguous 48 states, DC, and to all U.S. Military APO/FPO/DPO addresses.

Enjoy our FREE RETURNS

We want to ensure that making a return is as easy and hassle-free as possible! If for any reason you are not satisfied with your purchase, simply return the item within 30 days of receipt, and we'll cover the cost of return shipping. Learn more about our Return Policy.

Shopping Cart
JP Enterprises .936 Bore Alum. Gas Block with Detent Gas Adjustment
Currently Unavailable View Product
Compare (0)

JT's Review of JP Enterprises .936 Bore Alum. Gas Block with Detent Gas Adjustment

Purchased on 7/16/21. This .936 adjustable gas block with detent was defective in either design or craftsmanship through the machine process. The gas tube and roll pin holes were machined too low causing a misfit and rendered the gas block unusable. According to JP they want you to remove the gas screw and the detent set screw and then run a tap through the hole and into the side of the gas tube. The detent set screw and the gas screw were seemingly unremovable in mine. I applied so much torque in trying to remove the screws that it bent the supplied allen wrench nearly half way around. I feared that it would either strip the screw slots or break the allen wrench. According to JP their products may not be compatible with all other parts and some may need modification to function properly. With the gas tube into its proper place the gas screw would not screw in because it hit the side of the gas tube. Tapping the hole would not have made any difference because the tap would have stopped once it hit the side of the gas tube. It wasn't even close. I then proceeded to modify the tub so the gas set screw would screw completely into its intended positions and block the flow of gas when fully tightened. After fitting the tube to ensure function I then proceeded to pin the tube with the supplied roll pin. After pinning the tube I then checked once more for function and discovered that now the gas screw would not turn freely and it no longer screwed all the way in. I then attempted to remove the roll pin and figure out what the problem was and figured out that the roll pin hole was drilled in such a way that its opening entered into the detent set screw cavity that enters from the rear of the block. (another sign the gas tube was drilled to low into the block) The roll pin is now not removable at all because it cannot be punched out from the opposing side.
I contacted JP with the problems and informed them that the gas tube and roll pin hole was machined improperly too low (too close to the barrel) causing the gas screw to be blocked by the gas tube and causing the roll pin to be blocked by the detent set screw. JP was quick to respond to my email but not with a satisfactory resolution. Instead of offering to replace their defective gas block that obviously was machined improperly with one that did have the correct tolerances they suggested that I send it to them and pay for another gas tube and their services to install it. My reply to them was that the block was clearly without a single doubt machined improperly during the manufacturing process and that this particular block was not now nor ever would be able to function as intended due to the drilling being off. I also told them that I had no plans to spend anymore money on JP products after spending over $117 for a small gas block that they were not willing to replace.
On a side note- JP Enterprises entered a rifle for consideration to be used as a sniper rifle by the US military. The US military rejected the JP rifle in preference for the Knights Armament M110 SASS due to gas block issues on the JP Enterprises rifle that failed during their testing. My advise is to proceed with extreme caution before buying this gas block. Know ahead of time that JP says you must buy a tap and modify the tube even before installation is possible and also know ahead of time that JP will not stand behind their product if there is a machining error.
Pros:
  • None
Cons:
  • Poor craftsmanship
  • Poor quality control for fit
  • poor quality control for fit and function
Would Recommend: No
6 of 8 found the following review helpful.
Was it helpful to you? Yes | No
Share
Last updated 2025-11-12 UTC.