STI 2011 9/38/BUL Armory | Brass | Double Stack Open Magazine Base Pad
- In stock, ready to ship
- Backordered, shipping soon
STI 2011 Brass Magazine Base Pad – Open Division | 144g Weight Advantage
Add 144g of recoil-taming mass per magazine while gaining 40% more grip surface for lightning-fast reloads. These precision-machined brass base pads are built for Open Division performance—turning STI 2011 and Bul Armory magazines into perfectly weighted competition tools that drop free instantly and insert positively every time.
Why Open Division Champions Choose Our Brass Base Pads:
✅ 144g Weight Advantage – Heavy brass mass helps stabilize recoil and keeps mags dropping cleanly
✅ 40% Larger Grip Surface – More purchase and control during speed reloads
✅ Drop-Tested Durability – Built to survive repeated concrete drops
✅ Low Center of Gravity – Helps guide magazines home faster under pressure
✅ IPSC / USPSA Legal – Open Division compliant worldwide
✅ Direct Replacement – No magazine modification required
✅ Universal 9mm / .38 Super – Compatible with both calibers in 126mm / 140mm / 170mm magazines
Technical Specifications:
| Spec | Details |
|---|---|
| Material | Solid Brass |
| Weight | 144g (base pad) |
| Compatibility | STI 2011, Bul Armory double-stack, Clones |
| Caliber | 9mm and .38 Super |
| Magazine Type | 126mm / 140mm / 170mm Open Division |
| Finish Options | Black, Gold Plated, Chrome Plated |
| Installation | ~2 minutes |
| Division Legal | IPSC/USPSA Open Division |
The Open Division Weight Advantage Explained
In Open Division, consistency wins matches. The 144g brass base pad improves how your magazines behave under recoil and during reloads:
📊 Cleaner Drops: Extra mass helps the magazine eject positively
📊 Faster Handling: Larger base gives more grip when pulling from pouches
📊 Quicker Insertions: Low-weight distribution helps guide the mag into the well
📊 Matched Feel: Keep reload timing consistent across your mag set
📊 Better Impact Protection: Brass takes abuse better than lightweight alloys
Perfect For:
🎯 IPSC / USPSA Open Division competitors
🎯 3-Gun Open shooters
🎯 Speed shooting disciplines
🎯 Shooters chasing maximum stability + consistent reload feel
🎯 Building matched magazine sets
⚡ Build Your Complete Magazine System
Pair this base pad with other race-ready upgrades:
🔧 STI 2011 Ambi Safeties – Get more grip whilst torquing
🔧 STI 2011 Brass Magwell Open – Full brass weight system
🔧 STI 2011 Wide Adjustable Thumbrest – Speed-focused alternative
🔧 Extended Magazine Release – Faster mag drops
Complete Your Open Division Race Gun:
🏆 1911/2011 Red Dot Optic Multi Mount
🏆 Extended Firing Pin
🏆 Progressive Recoil Spring
Installation Instructions:
-
Unload magazine completely — verify chamber empty
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Depress retaining plate through witness hole
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Slide factory base pad off magazine body
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Remove spring and follower (note orientation)
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Install brass base pad in reverse order
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Ensure factory retaining plate clicks securely
Frequently Asked Questions
Q: What does “144g weight advantage” mean?
A: This refers to the base pad weight (144g)—a heavy brass pad that improves mag handling, drop reliability, and reload control.
Q: Can I use these in Limited Division?
A: These are built for 126mm / 140mm / 170mm Open Division magazines. Limited typically restricts to 140mm.
Q: Which finish is best?
A: Black is most popular for durability. Gold/Chrome help with visibility and mag identification.
Q: Do these require magazine tuning?
A: No—direct replacement. Always function test after installation.
Q: How many should I buy?
A: Most IPSC Open shooters run 4–6 magazines. Matching base pads across your competition mags helps consistency.
⚠️ Important Compatibility Notes
✅ Compatible: STI 2011, Bul Armory double-stack
✅ Calibers: 9mm and .38 Super
✅ Magazine length: 170mm Open Division (NOT 140mm Limited)
❌ NOT compatible: Single-stack 1911 magazines
❌ NOT compatible: Glock, CZ, Tanfoglio magazines
📦 Package Options & Bulk Pricing
-
Single Base Pad – $44.99
-
3-Pack Bundle – Save 10% (contact for pricing)
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5-Pack Bundle – Save 15%
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10-Pack Bundle – Save 20% (club orders welcome)
Why Boss Components
🏆 Competition Proven – Used by Australian Open Division shooters
🏆 Precision Manufacturing – CNC-milled to tight tolerances
🏆 Australian Stock – Ships within 24 hours
🏆 Expert Support – Competitive shooters on staff
📦 Shipping Information
✈️ In Stock: Ships within 24 hours
🇦🇺 Australia: Express 1–3 days
🌏 International: Philippines 5–7 days, USA 7–10 days
📍 Ships from Adelaide, South Australia
⭐ Upgrade your reload confidence and mag handling—run the 144g brass advantage and feel the difference in your next match.
Orders are typically dispatched within 24–48 hours on business days (Mon–Fri, excluding public holidays). All shipments include tracking details once dispatched.
Estimated Delivery Times
- Australia: Express 1–3 business days, Standard 3–7 business days (metro vs. regional may vary).
- International: Options shown at checkout; all orders shipped with tracking.
Please note that delivery times are estimates and may vary depending on the carrier or location. Retain packaging and contact us if you experience any transit issues.
