Contact Us

South Location
Phone: 612.412.1448

North Location
Phone: 612.326.4575
Fax: 320.358.3080

Lilja 6.5mm Grendel Barrel

place order

We're thrilled to announce a partnership between Six Sigma Arms, LLC and Lilja Precision Rifle Barrels to bring the phenomenal Lilja Grendel barrels back to market in their ultra-rare short configurations. At Six Sigma Arms we've been working with the Grendel in some manner since our inception nearly 15 years ago.

These barrels are currently being offered in 3 lengths; 10.5", 12.5", 14.5", and 16". All lengths have a profile that is essentially 0.725" for the length of the entire barrel with a 0.750" gas block. Barrels are threaded 5/8-24. There is not currently an option for re-profiling and/or fluting of the barrel. Schematics of the profiles are available for both the 12.5" and 16" barrels.

Any/all machine work is performed in-house by Lilja (including chambering, extension install, threading, etc). Barrels are chambered using SAMMI specs. These barrels are threaded for and furnished with a pinned barrel extension installed with proper headspace. The gas port hole is drilled and these are finished off with an 11° target crown. A narrow flat on the bottom side of the gas port section is milled for set screws used with some types of gas blocks. This prevents marring of the diameter by the set screws and helps align the gas block with the gas port hole. All barrels use an M4 style barrel extension and are ready to drop in to your selected upper. As with all Lilja barrels, these have 3-groove rifling and a 1:8" twist. All barrels less than 16" utilize a 0.073" gas port and a carbine length gas system (7"), the 16" barrel has a mid-length gas system (9"). Barrel markings will be under the hand guards on the 10.5" option and in front of the gas block on the 16" model. Markings read, "Lilja 6.5G 1-8 Six Sigma" ("Lilja" will be in their customary script font).

Finish from Lilja is polished stainless steel, finish ground to 320 grit. Optionally, we can Cerakote these prior to final delivery for an additional $75 in a number of colors (black, desert, FDE, tactical grey, etc). Cerakote will add a few weeks to delivery time. If you select Cerakote, we will reach out to you to discuss the details.

We also have 6.5mm Grendel bolts that we source directly from Lilja that work in perfect harmony with these barrels. If you add a bolt to your order, it will be headspaced to your barrel and coded accordingly.

Shipping is included in the price. If you would like a complete custom upper, please Contact Us and we can work out a quote.

NFA Disclaimer - Once a barrel shorter than 16" is assembled into a complete firearm, it becomes a regulated item by the National Firearms Act (NFA), unless it assembled into a pistol or a muzzle device that brings the total length to at least 16" is pinned/welded in place. Please check with your local and state municipalities for any further regulatory requirements as this varies by state. It is the buyer's responsibility to make sure they comply with all NFA regulations, and state/federal laws.

A quick note about barrel lengths; the measurements noted above (10.5", 12.5", & 16") are measured from the muzzle to a closed bolt (standard ATF measurement). The overall length of the barrel will measure approximately 1/2" longer.

Price: $455 $430

In Stock


If you have questions or can't find what you're looking for please contact us via our website or email us at sales@sixsigmaarms.com. We have access to significantly more items than what we have listed on our website.

Note: Items marked "In Stock" are on site at one of our facilities and ready to ship immediately unless the item notes indicate otherwise. Items marked "Available" are available through one of our distribution channels and will be acquired as soon as possible to fulfill your order. Select items are available for "Backorder" as well. These items will be ordered (or already have been ordered) and will be fulfilled as soon as they are received. Payment is due at the time of your order. For special arrangements, please feel free to give us a call. Thank you!