Home Tech Technical information Line SI Bushmaster front receiver screws

Line SI Bushmaster front receiver screws

There are a couple confusing differences between later and earlier Line SI Bushmasters.  One of those is the different front receiver/grip frame screws between very late Line SI bushmaster and earlier Bushmaster.

Two style of Bushmaster Thumb Screws
In the photo above, A is the shorter 8×32 screw for the later style bushmaster frame.  The longer screw, B, is also 8×32 and is the more common screw which works on the majority of Bushmaster frames.

Two different style of Line SI Receiver screws

 I think the screw style changed with the promaster since the same screw A is sometime used on promasters.

Two bushmasters showing the different screws


The photo above shows two Line SI Bushmasters with the different style screws.  

The later Navarone Bushmaster has the later one piece aluminum screw and the front frame hole is recessed and curved for the screw.  The threads are 8×32.

The bottom Terminator Bushmaster uses the more standard plastic cap 8×32 screw which sits flush against the bottom of the front of the receiver.

Hope that helps someone. Find Line SI parts here:

Take a second to support Paintball History on Patreon!


Please enter your comment!
Please enter your name here

MF2 Micrococker Sniper by MF2 designs

A neat example of the MF2 Micrococker by MF2 Designs. A rare Autococker from the mid to late 90s that was very compact and designed in Canada.

Sovereign to Autococker barrel thread adapter

A neat custom adapter that allows a Sovereign semi auto to take the barrel from an Autococker. Shown on a customized Bad Boyz Toyz Sovereign.

Planet Eclipse E2 and E1 Autococker Frame Menu Options

A detailed explanation and technical information on the Planet Eclipse E1 and E2 Frames for the Worr Game Products Autococker.

Identifying Carter Machine Autocockers

Carter Machine Autocockers came in many styles and designs. Some mods were for performance and others for aesthetics. In this write up I list what I've found.

A first generation Spyder

A closer look at the unique feature that separates a first generation Kingman Spyder from other models, the choker screw.
Take a second to support Paintball History on Patreon!