Frequently Asked Questions about the Dolos Quick Detach Barrel System AR-15
Q: Do you have install instructions available?
Q: Can I use the Dolos with a billet upper receiver?
A: The Dolos was designed using mil-spec drawings and measurements of upper receivers. Since many billet uppers are designed with external dimensions larger than mil-spec, the tabs on the back of the tri-lug assembly, or the receiver, may need to be modified to fit. It is possible to install the system with the tabs removed.
Q: Does the Dolos work with any gas tube length?
A: The Dolos can be used with any standard length DI gas tube: pistol, carbine, mid, or rifle length.
Q: Can I use the Dolos with a piston upper?
A: The Short answer: NO. The height of the gas block does not allow enough clearance for the handguard to be installed.
Q: Can I build an AR in any caliber with the Dolos?
A: Any caliber that can use a standard AR15 mil-spec, forged upper receiver can benefit from using the Dolos. We have had customers piece together .458 SOCOM and .50 Beowulf uppers with the Dolos installed without issue.
Note: Please remember that the larger bore calibers require a wider ejection port opening to function properly. Be sure that your barrel diameter is 1.000 inches or less.
Note: For blowback calibers (dedicated .22LR, 9mm, etc.) it is recommended that a faux gas system be installed. By faux gas system we mean a gas tube and gas block that will exist solely to retain the lock collar. Not using a faux gas system will allow the lock collar to spin freely and possibly slide off the end of the barrel when not attached to your upper.
Q: Can I combine my heavy barrel with the Dolos Barrel System?
A: As long as the diameter of the heavy barrel is 1.000 inches or less, then you can use it without issue.
Q: Will any brand upper, barrel, etc. work with the Dolos?
A: The Dolos was made to replace the barrel nut on an AR/M4 with mil-spec components. We recommend reaching out to the manufacturer, since not all manufacturers use mil-spec dimensions in the creation of their products it is best to contact them to see if the item in question is made to mil-spec dimensions.
Q: What parts do I need to add a second barrel/caliber?
A: You will need a Dolos standard lock collar and a handguard.
Q: What handguards work with the Dolos?
A: A list of compatible handguards can be seen below.
The rails and handguards listed below are compatible with the standard (1.850-30TPI) Dolos/Prometheus lock collar. (Some may require modification)