Yankee Hill Machine Products


REMOVABLE GAS BLOCK       AR 9390
This gas block replaces your existing front sight and allows the user to mount accessories to its two Picatinny rails. It is mounted by four Allen head cap screws for easy installation. Purchace our dovetail mounted flip front sight (AR 9371) to retain your iron sights. Made from high quality steel and finished with a mil. spec. phosphate coating.
AR 9390 $49.50
LOW PROFILE GAS BLOCK       AR 9381
This gas block replaces you existing front sight. It is mounted by the use of two set screws. This gas block provides a simple, low profile design that could be used to mount our rifle length forearms to a carbine length barrel. Manufactured from high quality steel and finished with a mil. spec. phospahate coating.
AR 9481 Price: $26.00
TRIPLE MOUNT       AR 639K
Made from aircraft quality aluminum and hardcoated to mil. specs. This mount attaches to the barrel of your ar rifle. It is designed to accept Picatinny style attachments. Its three mounting surfaces allow you to attach accessories such as flashlights, laser lights, etc. Clearance is provided to fit over your front sight, even with a bayonet lug. Mounts to barrels with diameters of .730 and .750 (required bushings included).
AR 639K Price: $70.00

FLIP FRONT SIGHT TOWER
This gas block is of an all steel construction for superior strength in demanding conditions. The flip sight is easily concealed with the push of a button and locks in the deployed position. This sight accepts all standard AR sight posts and hardware. With this setup you get the convenience of a flip front sight with the same weight as the standard AR sight tower. This sight's two-piece design allows it to be mounted to firearms with pinned or welded muzzle accessories. It mounts easily and securely with four caps screws. Features include a standard bayonet lug and sling mount.
AR-9394   $89.25

5 PORT FLASH SUPPRESSOR       AR 29
Made from gun quality steel and phosphate coated to mil. specs. This suppressor offers superior flash hiding with excellent performance in all conditions.
AR 29 Price: $35.00
PHANTOM FLASH SUPPRESSOR       AR 28
Precision CNC machined to tough military standards. Phosphate coated to mil. specs. This suppressor virtually eliminates flash and provides excellent performance with night vision. Incorporated in the design is the ability to use the suppressor in hand-to-hand situations.
AR 28 Price: $35.00
4 RAIL GAS BLOCK       AR 9380
Made from quality steel and finished with a mil. spec. phosphate plating. This gas block replaces your existing front sight and allows the user to mount accessories to its four Picatinny rails. This gas block can be mounted by either drilling and pinning it in place, or by the use of set screws and a bonding agent. Purchase our dovetail mounted flip front sight (AR 9371) to retain your iron sights.
AR 9380 Price: $54.00
SPECTOR GAS BLOCK
The design of this gas block allows the user to mount forearms that extend beyond the standard gas return system. Providing the inside diameter of the forearm is 1-5/8” or greater. It allows the mounting of our forearms without the removal of your pinned or welded muzzle accessory. This gas block consists of a simple, durable, two-piece design that is mounted by the use of four socket head cap screws. Made from high quality steel and finished with a mil. spec. phosphate coating.
Specter Gas Block For .625 Diameter Barrels $33.95
Specter Gas Block For .750 Diameter Barrels $33.95
FOLDING FORWARD GRIP       AR 9560
Designed & manufactured for use in tough combat situations. This grip will fold and lock in 3 positions simply by loosening the handle, setting in desired position, and tightening. Built to install easily on a Picatinny rail.
AR 9560 Price: $50.00
FORWARD GRIP       AR 9400
This grip mounts quickly and securely to all Picatinny rails. One quick twist allows this grip to be adjusted precisely where you want it. Simply untwist, slide to desired location, and twist to lock securely in place.
AR 9400 Price: $35.00
FORWARD PISTOL GRIP       AR 9420
Made from aircraft quality aluminum and hardcoated to mil. specs. This grip attaches to any Picatinny rail and accepts a variety of standard AR15/M16 grips. Will fit on our railed forearms, gas blocks, and triple mount.
AR 9420 Price: $38.00
FRONT SIGHT SLING MOUNT, THREADED     AR 9468
Made from aircraft quality aluminum and hardcoated to mil. specs. This sling mount can be installed in minutes without the use of special tools or modifications. All that is needed is a 7/64 allen wrench. The swivel can be relocated for right or left handed shooters without the removal of the mount.
AR 9468 Price: $30.00
DOVETAIL SLING MOUNT, THREADED       AR 9485S
This sling mount can be installed on any picatinny style rail. This product allows maximum comfort by allowing versatility in sling placement. Works great for both right and left handed shooters. Made from aircraft quality aluminum and hardcoated to Mil. Specs. This item includes the swivel stud AR 9469.
9485S Price: $25.00
BIPOD ADAPTER       AR 638
Made from aircraft quality aluminum and hardcoated to mil. specs. This adapter allows you to mount a harris bipod to any Picatinny rail.
AR 638 Price: $25.00
RAIL EXTENSIONS
Made from aircraft quality aluminum and hardcoated to mil. specs. Available in 5 inch (AR 9474) and 7 inch (AR 9473) lengths. This extension offers extra mounting surface to your flat top upper receiver or extends off you railed forearms or gas block to accept larger accessories such as laser sight combinations.
AR 9473 Price: $38.00
AR 9474 Price: $35.00 (not shown)

HALF INCH RISER       AR 9490
Made from aircraft quality aluminum and hardcoated to mil. specs. These risers fit any Picatinny rail. Great for elevating scopes, sights, etc. These smaller risers still increase the rise by one half inch.
AR 9490 Price: $12.50

SWIVEL STUD       AR 9469
This stud attaches to our products with the ability to adapt a
AR 9469 Price: $3.75
MOUNTING SCREW, THREADED       AR 9555
Made from quality steel and mil. spec. plated. Use this screw to mount our risers, sights, scopes, etc. This screw offers a mounting point for a swiveling sling mount.
AR 9555 Price: $11.50
MOUNTING SCREW, PLAIN       AR 9550
Made from quality steel and plated to mil. specs. Excellent for mounting our mini risers, sights, scopes, etc.
AR 9550 Price: $8.50

DOVETAIL ANGLE MOUNT
These mounts are great when used with scopes, flashlights, lasers etc. Accessories are mounted at a 45 degree angle. When used with scopes the iron sights remain visible. Made from aircraft quality aluminum and hardcoated to mil. specs.
AR-9486A   Price $15.25

3 SLOT DOVETAIL ANGLE MOUNT
This mount offers more mounting surface than our original Dovetail Angle Mount. They mount accessories at a 45 degree angle. When used with scopes the iron sights remain visible. Great for the offset mounting of lasers and flashlights. Made from aircraft quality aluminum and hardcoated to mil. specs.
AR-9690A   Price $24.95

5 SLOT DOVETAIL ANGLE MOUNT
This mount offers more mounting surface than our original Dovetail Angle Mount. They mount accessories at a 45 degree angle. When used with scopes the iron sights remain visible. Great for the offset mounting of lasers and flashlights. Made from aircraft quality aluminum and hardcoated to mil. specs.
AR-9691A  Price $28.95
RAIL RISERS
These rails come in lengths of 11.25 inches (full length for rifle length forearms), 7 inches (full length for carbine length forearms), and 4 inches. They elevate your accessories 1/2", come in standard picatinny configuration, and mount quickly and securely with thumb screws (included).
4" Rail Riser $37.00
Carbine Rail Riser (7") $58.75
Rifle Rail Riser (11.25") $81.35

SEE THRU THREE RAIL SYSTEM
This system offers 3 picatinny rails to mount optics and other accessories to without obstructing the view of the iron sights shown. Included in the design are two points for mounting a swiveling sling stud (AR-9469). Made from aircraft quality alimunum and hardcoated to mil. specs. AR-9492  Price $108.95

FRONT SIGHT ACCESORY MOUNT
This adapter is designed for use on the front sight for mounting a flashlight, laser, or other dovetail mounted accessory. Made from aircraft quality aluminum and hardcoated to military specifications. Includes all mounting hardware and sling stud. Rail length is 1-5/16” and has 3 slots. AR-9574  Price $73.50

 

 

TUBE FOREARM SYSTEM

These forearms come in lengths for a 16 inch or 20 inch barrel. Features include: two mounting points for a swiveling sling mount, this allows the user to select which side is most comfortable to mount a sling on, ability to install our forearm front barrel support (sold separately) for improved reliability, and will accept our forearm system rails. The addition of the forearm front support allows the shooter to select either a free-floating barrel design or a fully supported barrel for improved reliability. This forearm meets or exceeds the military standards of rail orientation to the barrel of the firearm. This assembly includes: one forearm tube (of specified length), one barrel nut, and one jam nut. The barrel nut and forearm tube are made from aircraft quality aluminum and hardcoated to mil. specs. The jam nut is made from quality steel and phosphate coated. The forearm front support and forearm rails must be purchased separately.
AR 9431A: Forearm Tube for 16 Inch Barrel Price: $78.50
AR 9432A: Forearm Tube for 20 Inch Barrel Price: $105.00

FOREARM FRONT BARREL SUPPORT


Made from aircraft quality billet aluminum and mil. spec. plated. This support installs into our forearms to add support to your barrel. Other forearms are not designed to support the barrel in any way. It simply hangs off of the upper receiver. With this attachment the barrel is supported by the forearm as well as the receiver. This drastically improves the reliability of the rifle even under strenuous firing conditions. Computer designed heat venting allows for maximum comfort for the shooter and the best performance for your firearm.
AR 9484: Forearm Front Barrel Support Price: $16.75

FOREARM SYSTEM RAILS


These rails come in four different sizes to accommodate your specific mounting needs. Made in standard Picatinny configuration, these rails mount easily to our forearm system tube with allen screws. Made from aircraft quality aluminum and hardcoated to mil. specs. Available in three inch, four inch, seven inch, and twelve inch lengths.
AR 9464-3: Forearm System Rails (3") Price: $18.75
AR 9464-4: Forearm System Rails (4") Price: $19.75
AR 9464-7: Forearm System Rails (7") Price: $25.00
AR 9464-12: Forearm System Rails (12") Price: $37.00