Adapter Guide for PT-1 / PT-1S / PT-3 / PT-3S Stocks — Overview and Selection Guide
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Types of adapters (brief classification)
1. Adapter for AKS / AKS-74U
- Stock axis diameter: 4.5 mm
- Designed for the folding tubed stocks of this family.
- Compatibility: PT-1, PT-1S, PT-3, PT-3S (unless otherwise noted).
2. Adapter for AK (folding-stock models, with folded-position operation supported)
- Stock axis diameter: 5.5 mm
- Supports folded-position operation.
3. Adapter for civilian AK-pattern carbines based on the AK (folded-position operation not supported)
- Stock axis diameter: 5.5 mm
- Folded-position operation is not supported (the stock is fixed in the operating position).
4. Adapter for Saiga-9
- Stock axis diameter: 5.5 mm
- For Saiga-9; folded-position operation is not supported.
5. Adapter for Ten?-19
- Special adapter for this model (diameter and construction per the product’s technical specification).
6. Fixed adapter for AKM (non-folding)
- Material: D16T alloy (aluminum alloy)
- Feature: fixed — not compatible with PT-3 and PT-3S. Compatible with PT-1.
- Used on AKM and carbines based on AKM.
Compatibility table (quick reference)
| Adapter / Sporting Equipment model | Axis (mm) | Folding? | Compatible with PT-1 / PT-1S | Compatible with PT-3 / PT-3S |
|---|---|---|---|---|
| AKS / AKS-74U | 4.5 | Yes | Yes | Yes |
| AK-pattern 5.5 mm folding-stock interface | 5.5 | Yes (folded-position operation supported) | Yes | Yes |
| Civilian carbines based on AK (folded-position operation not supported) | 5.5 | No (fixed) | Yes | Yes |
| Saiga-9 | 5.5 | No | Yes | Yes |
| Ten?-19 | (per tech spec) | Depends on version | Yes | Yes |
| Fixed adapter for AKM (D16T alloy) | (AKM standard) | No | Yes (PT-1) | No (PT-3 / PT-3S incompatible) |
Note: Except for the fixed AKM adapter, other adapters are generally compatible with both types of stocks (PT-1 and PT-3) unless explicitly stated otherwise.
Materials and operating parameters
- Adapter material: steel for folding adapters; fixed AKM adapter — D16T alloy.
- Operating temperature range: ?50 °C to +50 °C.
- Guaranteed storage and service life: 60 months.
How to choose (step-by-step)
- Identify your sporting equipment model and whether it supports a folding stock.
- If you have an AKS or AKS-74U — choose the adapter with a 4.5 mm axis.
- For compatible AK-pattern platforms and carbines — use 5.5 mm axis adapters.
- For Saiga-9 — use the dedicated Saiga adapter (5.5 mm).
- For AKM — if you need the fixed version, choose the fixed adapter (D16T) and remember it is not compatible with PT-3/PT-3S.
- Decide whether you need folded-position operation.
- If yes — choose the AK 5.5 mm adapter specified for compatible folding-stock platforms.
- If no — civilian/fixed adapters will be suitable.
- Specify your sporting equipment model when ordering a stock.
Adapters usually come with the stock, but you must indicate your sporting equipment model clearly so the correct adapter is included.
Installation and kit contents
- Adapters are included in the stock package (PT-1, PT-1S, PT-3, PT-3S) when purchased — specify your sporting equipment model at checkout.
- The fixed AKM adapter is noted separately in the kit and is compatible only with PT-1.
- Installation is normally done with standard tools; some models may require minor adjustments or professional assistance.
Seller recommendations / text for product listing
Always indicate: sporting equipment model, year (if applicable), whether folded-position operation is required, and compatibility with PT-1 / PT-3.
Example listing line:
“Adapter included — choose: AKS (4.5 mm), AK (5.5 mm, folded-position operation), Saiga-9 (5.5 mm), Ten?-19, Civil AK (5.5 mm, folded-position operation not supported), Fixed AKM (D16T, PT-1 only).”
Conclusion and order checklist
Before ordering, make sure you have:
- The exact sporting equipment model (for example, AKS-74U, Saiga-9, AKM, etc.).
- Determined whether you need folded-position operation.
- Confirmed which stock version you are buying (PT-1 / PT-3 and their S variants) to avoid incompatibility (fixed AKM adapter ? PT-3/PT-3S).
