WARNING: IF THIS FIREARM IS CARELESSLY OR IMPROPERLY HANDLED, UNINTENTIONAL DISCHARGE COULD RESULT AND COULD CAUSE INJURY, DEATH, OR DAMAGE TO PROPERTY. CAUTION: CAREFULLY READ THIS INSTRUCTION MANUAL PRIOR TO LOADING AND FIRING THIS FIREARM.
WARNING: BEWARE OF DANGEROUS PROCEDURES ● Be sure cam pin is correctly installed in the bolt group. If it is not, your rifle can still fire and may explode. ● If your rifle stops firing with a live round in the chamber of a hot barrel (a misfire), remove the round fast. However, if you cannot remove it within 10 seconds, remove the magazine and wait 15 minutes with the rifle pointing in a safe direction. This way you won’t get hurt by the possible round “cooking-off” (i.e.
TABLE OF CONTENTS Basic Rifle Parts Overview ............................................... 6 Clearing Your Rifle ........................................................... 7-8 Disassembling Your Rifle .................................................. 9-12 Cleaning/Inspection/Lubrication ....................................... 13 Cleaning the Upper Receiver ............................................ 13 Cleaning the Lower Receiver ............................................ 14 Cleaning the Ejector ....
FACTS ABOUT YOUR STI SPORTING RIFLE The STI SPORTING RIFLE system consists of a rifle and a magazine. It is a lightweight, gas operated, air cooled, magazine-fed, shoulder-fired weapon that can be fired in a semi-automatic mode – i.e., a single shot each time the trigger is pulled. ● The upper and lower receivers are easily opened for cleaning and inspection. ● The bolt group and barrel extension are designed with locking lugs that lock the bolt group to the barrel extension.
Basic Parts Overview
Clearing Your Rifle pt I Make sure to point rifle in a SAFE DIRECTION! 1) Place Safety Selector Lever on SAFE. Tip: If the rifle is not cocked the Selector Lever cannot be pointed toward SAFE 2) Press Magazine Catch Button with trigger finger and with the other hand pull Magazine straight down to remove from rifle. 3) To lock Bolt open, pull the Charging Handle rearward. Press the bottom of the Bolt Catch & allow Bolt to move forward until it engages Bolt Catch. Return Charging Handle to forward postion.
Clearing Your Rifle pt II 4) Check both Receiver and Chamber to ensure there is no ammuntion in the Rifle. 5) With Selector Lever pointed towards SAFE, allow Bolt to go forward by depressing the upper portion of the Bolt Catch.
Disassembling Your Rifle pt I Tip: Clear Rifle and Disconnect the Sling before proceeding. 1) Using a punch or small screwdriver, push in Takedown Pin as far as it will go. Pivot Upper Receiver away from Lower Receiver. 2) Using a punch or small screwdriver, push in Front Pivot Pin. Tip: Although you CAN push the pin all the way out, it is easier to leave it in just a little. 3) Separate the Upper & Lower Receivers.
Disassembling Your Rifle pt II 4) Pull back Charging Handle & Bolt Carrier 5) Remove Bolt Carrier & Bolt 6) Remove Firing Pin Retaining Pin Tip: Do NOT open or close the split end of the pin 7) Push Bolt into locked position and drop Firing Pin out rear of Bolt Carrier.
Disassembling Your Rifle pt III 8) Remove Bolt Cam Pin Tip: Give Cam Pin a 1/4 turn and lift out 9) Remove Bolt Assembly from Carrier 10) Remove Extractor Pin by pushing out with a punch Tip: Press Rear of Extractor to check Spring function
Disassembling Your Rifle pt IV 12) Remove Extractor & Spring Caution: If care is not taken to prevent it, the Extractor Spring may pop out and be lost 13) Press in Buffer, depress Retainer, and release Buffer 14) Remove Buffer and Action Spring STI does NOT recommend any further disassembly
Cleaning, Inspection, & Lubrication • • • • • After firing, clean your rifle as soon as possible to both make the job easier and to avoid allowing corrosion to develop. If your firearm has not been fired, you should still clean it at least once or twice a year if you live in a temperate climate, or as often as once a week in a tropical climate. If you get your firearm wet, clean it as soon as possible.
Cleaning the Lower Receiver 1) Clean all areas of powder fouling, corrosion, dirt and rust. Never use a wire brush or any type of abrasive to clean the aluminum Lower Receiver as it might adversely affect the finish. 2) Wipe any dirt from the Trigger Mechanism, the Buffer, Action Spring, and inside the Lower Receiver Extension (the Buffer Tube). Cleaning the Ejector The design of the Ejector makes its disassembly for cleaning somewhat impractical (i.e. STI doesn’t recommend it).
Lubrication UPPER RECEIVERLightly lubricate the inside of the Upper Receiver, the Bore and Chamber with a high quality gun oil. Be sure to lube in and around all the Locking Lugs. LOWER RECEIVERLightly lubricate the inside of the Lower Receiver Extension (Buffer Tube), the Buffer, the Action Spring, and contact surfaces of the Fire Control with a high quality gun oil. BOLT CARRIER GROUPLightly lubricate the Firing Pin with oil – also the Firing Pin Recess in the Bolt.
Reassembly pt I 1) Insert action spring and buffer. Depress buffer detent and push buffer in past the detent, then release.
Reassembly pt II WARNING: Be sure the Cam Pin is installed in the bolt group. If it is not, your rifle can still fire and may explode. NOTE: The Bolt is machined so as to allow insertion of the Cam Pin from one side only. This provision aligns the Extractor and Ejector properly within the Upper Receiver.
Reassembly pt III 7) Pull Bolt Out 8) Replace Firing Pin Retaining Pin Tip: Firing Pin should NOT fall out when Bolt Carrier Group is turned upside down 9) Engage, then push Charging Handle part way 10) Position Carrier Key in slotted bottom of Charging Handle. Slide in Bolt Carrier Group. Push Charging Handle and Bolt Carrier into Receiver together.
Reassembly pt IV 11) Join Upper & Lower Receivers and engage the Receiver Pivot Pin CAUTION: Selector Lever should be on SAFE before closing Upper Receiver 12) Close the Upper & Lower Receiver groups and push in the Takedown Pin This completes the reassembly process
Safety Function Check 1) Remove Magazine (if installed.) Pull Charging Handle Assembly to rear. Check that Chamber is clear. Let Bolt and Bolt Carrier close. Do not pull Trigger. Leave hammer in cocked position. WARNING: If rifle fails any of the following tests, continued use of the rifle could result in injury to, or death of, personnel. Discontinue use immediately and take your rifle to a qualified gunsmith. 2) Place Selector Lever in SAFE position and pull Trigger. THE HAMMER SHOULD NOT FALL.
Operation of Your Rifle WARNING: Please review all safe handling practices before continuing. Move Safety Selector to SAFE, open Bolt, & check Chamber before inserting Magazine into the Rifle. Inserting a Magazine Note: The Magazine may be inserted into the Rifle with Bolt Assembly open or closed. 1) Push Magazine up into Magazine Well until Magazine Catch engages and holds the Magazine in place. Tap upward on bottom of the Magazine to ensure proper seating.
Operation of Your Rifle Chambering a Round with Bolt Assembly Closed 1) Pull Charging Handle fully to the rear. 2) Release the Charging Handle. CAUTION: Never push (or “ride” the Charging Handle- let it move forward on its own. 3) Tap the Forward Assist to ensure the Bolt is fully forward and locked (only if necessary). Immediate Action in Case of Trouble WARNING: If your rifle stops firing with a live round in the chamber of a hot barrel (a misfire), remove the round fast.
Immediate Action in Case of Trouble 2) Pull Charging Handle all the way back. Observe ejection of case or cartridge. Check Chamber for obstructions. WARNING: Do NOT load with a hot chamber. A round may “Cook Off” (fire from the heat of the chamber) 3) If cartridge or case is ejected or Chamber is clear, release Charging Handle to feed a new round. Do NOT “ride” the Charging Handle forward. 4) Tap Forward Assist 5) Your Rifle is now ready to fire.
Disassembly View Note: This is not intended as an exhaustive list of all rifle parts. STI does not recommend breaking down the rifle any further than shown except by a qualified gunsmith.
