Bcm Set Screw: What Drive Size Do You Need?

The size of the drive for a BCM set screw depends on the specific BCM product. For example, the BCM KMR Cross Bolts Kit (Set of 2) includes a cross bolt notched and a cross bolt locking. The BCM Low Profile Gas Block (steel with set screws) 750 has a set screw mounting with steel 10-32 x 3/16 knurled cup point screws. The BCM KMR Handguard Installation Kit and the BCM SOPMOD Bolt Upgrade/Rebuild Kit also include set screws. The BCM grip installation screw is a flat, slotted screw that requires a flat-head screwdriver.

BCM grip screwdriver size

The BCM grip screwdriver size for the BCM grip installation screw is a flat-head screwdriver. The screw size is 1/4-28. The length of the screwdriver should be at least 3/4in to be safe.

If you are using the BCM screw, a 3/8" wide screwdriver is required. However, some users have noted that a 5/16" slotted screwdriver can also work, but it may rattle a little as it is a little too thin.

If you are looking for an alternative to the BCM screw, you can consider a 1/4-28 capscrew, a hex head cap screw, or a hex socket screw.

BCM grip screw alternatives

The BCM Gunfighter's Grip is a pistol grip manufactured by Bravo Company USA. It is available in two versions: with and without a backstrap. It also includes modular inserts to close the gap between the trigger guard and pistol grip. The grip features a reduced, more vertical angle compared to the standard A2 pistol grip for the AR-15 series of weapons. It is also compatible with any weapon that takes the standard AR grip, such as the SCAR 16 or 17.

The Gunfighter's Grip comes in two models: Mod 0 and Mod 1. The Mod 0 is similar to an A1/A2 backstrap, while the Mod 1 has a high-rise back strap for larger hands and longer fingers. Both models are available in black, flat dark earth, and foliage green. The grip is made in the USA from high-quality impact-resistant polymers.

The sides of the grip are textured, with a pattern similar to the laser swirl pattern found on the TangoDown SCAR panels. The front strap of the grip features raised horizontal ridges for improved purchase.

The Gunfighter's Grip also includes a large storage compartment that can be used to store small items. The compartment is sealed by a hinged trapdoor with a unique design. To open the trapdoor, the user squeezes two ears on each side, which compresses a rubber plug and allows the door to be unlocked.

• TangoDown Battlegrip BG-FG Flip Grip: This grip allows the shooter to change weapon grip angles without the use of tools. The user can choose between 24 degrees of rake or a true vertical position for a more comfortable shooting hand wrist angle. The Flip Grip has a strong spring-loaded design and is made of stainless steel.
• Magpul Pistol Grip: Magpul offers a range of pistol grips that are compatible with AR-15 platforms. Their grips feature ergonomic designs and textured surfaces for improved grip and comfort.
• Geissele Automatics Super Semi-Automatic Enhanced SSA-E Two Stage AR-15 Trigger: This trigger offers a two-stage design for improved accuracy and control. It has a smooth, crisp break and a short reset for faster follow-up shots.
• B5 Systems Bravo Stock: This stock offers a range of adjustment options to customize the length of pull and cheek weld. It is made from durable materials and provides a stable shooting platform.
• Geissele Maritime Bolt Catch: This bolt catch is designed for use in maritime environments and features a corrosion-resistant finish. It offers a large surface area for easy manipulation, even with gloves.

BCM grip screw length

The BCM grip screw length is a topic that has been discussed extensively on forums, with varying opinions and suggestions provided by users. While there is no definitive answer, here is a compilation of the information and recommendations provided by users.

The BCM grip screw comes in two types: the regular flat, slotted screw, and the milspec screw. The flat, slotted screw is the more common type and is included with the BCM grip. However, some users have expressed their dislike for this type of screw, as it can be challenging to work with, especially in tight spaces. The milspec screw, on the other hand, is less common but is preferred by some users as it is easier to install and remove.

When it comes to the length of the BCM grip screw, there are two common options: the 3/4-inch screw and the 1-inch screw. The 3/4-inch screw is suitable for most grips, including the Magpul grips, as they have a thinner polymer shelf. The 1-inch screw, on the other hand, is compatible with a wider range of pistol grips and provides more thread engagement, which can be beneficial for added strength. However, it may not be compatible with some thinner grips, such as those from Magpul, as the screw can protrude beyond the pistol grip screw hole and interfere with the trigger mechanism.

To install the BCM grip screw, it is recommended to use a flat-head screwdriver or a bit that fits snugly into the screw slot. Some users have suggested using a hollow-ground screwdriver or bit, as it provides a better fit and reduces the risk of damaging the screw slot. Additionally, using a magnetic tip screwdriver can be advantageous when working with carbon steel socket head cap screws.

When tightening the BCM grip screw, it is important not to overtighten it. A torque of 30-35 inch-pounds is generally recommended for the 3/4-inch screw, while a torque of 35 inch-pounds is suggested for the 1-inch screw. It is also worth noting that some users have suggested using thread locker products, such as Loctite, to prevent the screw from backing out. However, others advise against this, stating that proper torque is sufficient.

In summary, the BCM grip screw length depends on the type of grip being used and personal preference. The 3/4-inch screw is suitable for most grips, while the 1-inch screw offers more thread engagement but may not be compatible with all grips. It is important to use the correct tools and apply the appropriate torque to ensure a secure and functional installation.

BCM grip screw torque

The BCM grip screw torque is a topic that has been discussed extensively on online forums, with varying opinions and recommendations. While there is no definitive consensus, some users have suggested a torque value of around 35 inch-pounds for a 1" inch grip screw. This specification is said to have originated from Bill Alexander of Alexander Arms. It is recommended that this torque value should not be exceeded to prevent potential damage.

One user shared their experience of installing a new grip onto a BCM lower, where they encountered significant resistance halfway through the process. They attributed this issue to the excessive amount of thread locker compound pre-applied to the threads, rather than the torque value. They resolved the problem by removing the compound, applying blue Loctite, and tightening the screw until it was snug against the plastic, with an additional quarter turn.

Another user suggested that there is no specific torque value for grip screws and that simply snugging the screw is sufficient. They emphasised that using a star lock washer can further enhance the security of the grip. This sentiment was echoed by other users, who shared their experiences of not encountering any issues by just snugging the grip screw with a star lock washer.

It is worth noting that some users have expressed concerns about the quality of the Magpul grip screw, recommending the use of alternative screws or washers to ensure a secure fit.

BCM grip screw installation

Tools and Materials

To install a BCM grip screw, you will need the following tools and materials:

• A BCM grip with a regular flat, slotted screw (not the mil-spec one)
• A 3/8” wide flat-head screwdriver (slightly wider than the screw head)
• A 1/4-28 capscrew (optional)
• A 3/8” wide flat-head screwdriver (optional)
• A torque wrench (optional)
• Loctite or other thread locker (optional)

Installation Steps

• Place the BCM grip onto the firearm, ensuring that the grip is properly aligned with the lower receiver.
• Insert the flat, slotted screw through the grip and into the threaded hole in the lower receiver.
• Using the 3/8” wide flat-head screwdriver, tighten the screw securely. Take care not to over-tighten, as this can damage the screw head or strip the threads.
• Optionally, you can apply a small amount of Loctite or other thread locker to the screw threads before tightening to prevent the screw from loosening over time.
• For added security, you can use a torque wrench to tighten the screw to a torque value of 35 inch-pounds. This will ensure that the screw is tight enough to hold the grip in place without damaging the threads or the screw head.

Tips and Troubleshooting

• If you are having trouble finding a screwdriver that fits the BCM screw, you can try using a standard flat-head screwdriver from a hardware store or a multi-bit screwdriver set.
• If you prefer a different type of screw, such as a hex bolt or a Magpul grip screw, you can replace the BCM screw with a 1/4-28 capscrew or a similar option.
• To prevent the screw from falling off the screwdriver, consider using a magnetic tip screwdriver or a carbon steel socket head cap screw.
• If you are concerned about the screw length, a 1" inch screw will provide more thread engagement than a 3/4" inch screw and is compatible with most pistol grips. However, a shorter screw may be necessary for some grips with thicker polymer shelves, such as A1 and A2 type grips.

Frequently asked questions