If your handguard is not on our list of compatible aftermarket handguards then you will not be able to use it with your Dolos (the list is updated as new compatible handguards are found). Our Prometheus kits come with one of our handguards and is typically less expensive than purchasing a Dolos and handguard separately.
With our handguards you will want to use the three Allen screws that were included. Thread the handguard all the way down the lock collar, attach your barrel assembly to your upper and loosen the handguard until the rail aligns with your upper. Tighten the handguard to the lock collar by evenly torquing the Allen screws. There should be a gap roughly 5/64" between the two sides when the handguard is sufficiently tight.
For YHM and other handguards that use a jam nut, attach your barrel to your upper with the lock collar as tight as you can by hand (loosen the collar and tighten again a few times to be sure it's tight). Thread your jam nut onto your lock collar, then the handguard as far as you can to the point it aligns with your receiver rail. Tighten your jam nut against your handguard slightly, pull the release and loosen your lock collar, then give a good firm twist to tighten the collar. Check the rail alignment, verify that the lock collar is tight against your barrel extension, adjust the rail if necessary,
Any caliber that uses a standard AR15 upper receiver can be used with the Dolos. This includes, but is not limited to: 5.56x45mm (.223REM), 5.45x39mm, 300BLK, 6.5 Grendel, 6.8 SPC, 7.62x39, 9mm, 40S&W, 45ACP, 10mm, 450 Bushmaster, 458 SOCOM, 50 Beowulf.
For 450 Bushmaster, 458 SOCOM, and 50 Beowulf you will need an upper where the ejection port is enlarged to allow the casings to eject.
The Dolos is not compatible with 5.7x28mm (FN 5.7) uppers.
The Dolos was designed based on mil-spec tech drawings of upper receivers. Since most billet uppers have external dimensions larger than mil-spec, the tabs on the back of the tri-lug assembly, or the receiver, would need to be modified to fit. It is possible to install the system with the tabs removed.
Pistol, carbine, mid-length, and rifle length gas tubes are all compatible. You are not limited to a specific gas length; however, direct impingement 45ACP uppers require the gas block to be placed too close to the upper to be compatible with the Dolos.
You will need a Dolos standard lock collar and a handguard. We have barrel kits available which include one of our handguards, or check out the list of compatible handguards from other manufacturers on our support page.
Yes, you can. Since there isn't a gas block or tube to retain the lock collar, we recommend using our Barrel Stop-Pistol Caliber specifically for blowback builds to provide an index point and limit the collar movement when it's not attached to your upper.
We have one tube profile that is specific to SB Tactical (Sig Brace) pistol braces (SKU: KTRSB), and one that is tailored to the Shockwave Blade (SKU: KTRSH). The SB profile is 1.203" and tapers up to a larger diameter to allow the soft rubber to slide on more easily and still secure the brace. The Shockwave is 1.240" and has a shoulder that stops the brace roughly an inch from the rear of the receiver.