How the STP Caliber Conversion System Works – Reliable Multi-Caliber Setup I STP

Welcome to another episode of Technical and Practical Insights from STP – Sport Target Pistol!

In this video, Karl Prommersberger explains how to properly use our caliber conversion system – and avoid the common mistakes shooters run into when switching from .45 ACP to 9mm or .40 S&W.

🎯 What makes STP conversion systems special?
One frame → multiple calibers
Drop-in slide & barrel kits for 9x19mm, .40 S&W, .45 ACP
No paperwork required – legal and easy to use
Custom-fitted extractors for each caliber ensure reliable ejection

🧠 What you’ll learn:
Why a caliber swap requires the correct extractor
How case rim dimensions affect extractor engagement
How to recognize mismatched extractors
The difference between pinned extractors (fixed models) and drop-in extractors (conversion-ready models)
The most common mistake: wrong extractor = malfunctioning slide

💡 Pro Tip:
Most kits include two extractors – one for each caliber.
Check the packaging → install the right one → everything runs smoothly.

🗣️ Disclaimer: This video features AI-translated voiceover. Minor translation errors may occur.
Questions? Drop them in the comments – we’re happy to help.

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