McBROS McMillan 50BMG Bull Barrel Mag Fed Bolt Action Rifle & Leupold MK4
SOLD FOR: $5,500.00
LSB#: WY250313JR016
Make: McBROS, Phoenix Arizona.
Model: BMG
Serial Number: 182J
Year of Manufacture : Modern
Caliber: .50 BMG
Action Type: Single Shot Bolt Action rifle fed by a 4 round internal box magazine.
Markings: The buttpad is marked “Decelerator”. The left side of the receiver is marked “BMG 182J McBROS PHOENIX, AZ USA”. The scope is marked “LEUPOLD MARK 4 4.5-14×50 mm LR/T”.
Barrel Length: 30″ full size Bull barrel, 33” with the four chamber muzzle brake. This rifle weighs approximately 33LBS.
Sights / Optics: The top of the receiver has a picatinny rail with a Leupold Mark 4 4.5-14 x 50mm LR/T mounted to it. The scope has exposed MIL turrets, side parallax adjustment, and MIL scale reticle. The sight picture is clear and the light transmission is good, the turrets adjust with positive clicks. Overall the scope is in Very Good condition.
Stock Configuration & Condition: The stock is a McBros benchrest style stock with integrated bi-pod, textured forend, palm swelled semi pistol grip, straight comb, with a large rubber buttpad. The bi-pod functions correctly and cants. The stock shows mild handling wear with some surface level scratches scattered throughout. The buttpad is soft and pliable. The bi-pod does show some scattered light rust freckling that should be able to be cleaned off. There are no visible chips or cracks. The length of pull is 13.75” from the front of the trigger to the back of the buttpad. Overall the stock is in Very Good to Very Good+ condition.
Magazine Quantity & Condition: This rifle has an internal 4 round box magazine.
Type of Finish: Black.
Finish Originality: Original
Bore Condition: The bore is bright and the rifling is sharp. There is no erosion in the bore. There is some minor fouling present on the lands in the bore. The muzzle device shows some minor carbon build up. In this writer’s opinion the bore rates 9.5/10.
Overall Condition: This rifle retains about 99% of its metal finish. The balance of the finish shows only very light handling wear from responsible use and storage. The screw heads are sharp. The pins are unmarred. The markings are clear. Overall, this rifle rates in about Very Good+ to Excellent condition.
Mechanics: The action functions correctly. We did not fire this rifle. As with all used firearms, a thorough cleaning may be necessary to meet your maintenance requirements.
Box, Paperwork & Accessories: None.
Our Assessment: This MCBROS .50 BMG benchrest-style bolt-action rifle, built by McMillan Brothers (MCBROS) of Phoenix, Arizona, is a precision engineered long range powerhouse designed for extreme distance shooting and uncompromising accuracy. Weighing in at 33 pounds, this rifle features a 30-inch heavy bull barrel for maximum rigidity and minimal vibration, ideal for delivering consistent shots at ultra-long range. The four-chamber muzzle brake dramatically reduces recoil, making the powerful .50 BMG cartridge manageable for benchrest shooting. The fluted bolt enhances smooth cycling and reduces weight while improving heat dissipation. An internal 4-round box magazine keeps the profile clean and is optimized for prone and bench shooting positions.
Mounted with a Leupold Mark 4 4.5–14x50mm LR/T (Long Range/Tactical) scope, this setup is purpose-built for precision. The scope offers excellent glass clarity, precise mil-dot ranging, and side focus parallax adjustment, giving shooters the tools needed to dial in shots at extreme distances. The robust construction and track record of the Leupold Mark 4 series make it a natural fit for the .50 BMG platform. McMillan Brothers rifles, known for their custom craftsmanship and tactical pedigree, are highly respected among precision shooters and military/law enforcement circles. This rifle is not just a long-range tool, it’s a specialized instrument built to deliver repeatable hits at distances where most rifles fall short. Please see our high quality photos via the link and best of luck with your bidding!!!-R.L.
