The rear slide cover plate is the small panel at the back of the slide that retains the firing pin channel components. Functionally it does one job — hold the spacer sleeve and firing pin spring cups in place — which is why it is the single easiest part on a Glock to personalise without touching anything that affects how the pistol shoots.
How fitment works
Fitment splits mainly on generation. Gen 1–4 slides and Gen 5 slides use different plate profiles, and the slim-frame guns (43, 43X, 48) use their own. An armourer’s plate — usually orange, with a half-height cut — is a different item again: it is a bench tool for checking firing pin protrusion, not something to carry.
Fitment chart
| Glock model & generation | Part | Notes |
|---|---|---|
| Glock 17 All | NDZ Conversation Heart Rear Plates | Direct fit — verified for this model and generation. |
| Glock 17 Gen 3 | Glock OEM Orange Rear Slide Cover Test Armorers Plate SP05865 GEN 1-5 | Direct fit — verified for this model and generation. |
| Glock 17 Gen 4 | Glock OEM Orange Rear Slide Cover Test Armorers Plate SP05865 GEN 1-5 | Direct fit — verified for this model and generation. |
| Glock 17 Gen 5 | Glock OEM Orange Rear Slide Cover Test Armorers Plate SP05865 GEN 1-5 | Direct fit — verified for this model and generation. |
| Glock 19 All | NDZ Conversation Heart Rear Plates | Direct fit — verified for this model and generation. |
| Glock 19 Gen 3 | Glock OEM Orange Rear Slide Cover Test Armorers Plate SP05865 GEN 1-5 | Direct fit — verified for this model and generation. |
| Glock 19 Gen 4 | Glock OEM Orange Rear Slide Cover Test Armorers Plate SP05865 GEN 1-5 | Direct fit — verified for this model and generation. |
| Glock 19 Gen 5 | Glock OEM Orange Rear Slide Cover Test Armorers Plate SP05865 GEN 1-5 | Direct fit — verified for this model and generation. |
| Glock 19X All | NDZ Conversation Heart Rear Plates | Direct fit — verified for this model and generation. |
| Glock 19X Gen 3 | Ghost Armorers Orange Half Slide Cover Plate Tool for Glock GEN 1-5 | Direct fit — verified for this model and generation. |
| Glock 19X Gen 4 | Ghost Armorers Orange Half Slide Cover Plate Tool for Glock GEN 1-5 | Direct fit — verified for this model and generation. |
| Glock 19X Gen 5 | Glock Gen 5 Custom Rear Slide Plates | Browse range — no single SKU listed for this model. |
| Glock 21 Gen 3 | Glock OEM Orange Rear Slide Cover Test Armorers Plate SP05865 GEN 1-5 | Direct fit — verified for this model and generation. |
| Glock 21 Gen 4 | Glock OEM Orange Rear Slide Cover Test Armorers Plate SP05865 GEN 1-5 | Direct fit — verified for this model and generation. |
| Glock 21 Gen 5 | Glock OEM Orange Rear Slide Cover Test Armorers Plate SP05865 GEN 1-5 | Direct fit — verified for this model and generation. |
| Glock 22 All | NDZ Conversation Heart Rear Plates | Direct fit — verified for this model and generation. |
| Glock 22 Gen 3 | Glock OEM Orange Rear Slide Cover Test Armorers Plate SP05865 GEN 1-5 | Direct fit — verified for this model and generation. |
| Glock 22 Gen 4 | Glock OEM Orange Rear Slide Cover Test Armorers Plate SP05865 GEN 1-5 | Direct fit — verified for this model and generation. |
| Glock 22 Gen 5 | Glock OEM Orange Rear Slide Cover Test Armorers Plate SP05865 GEN 1-5 | Direct fit — verified for this model and generation. |
| Glock 23 Gen 4 | Glock OEM Orange Rear Slide Cover Test Armorers Plate SP05865 GEN 1-5 | Direct fit — verified for this model and generation. |
| Glock 23 Gen 5 | Glock OEM Orange Rear Slide Cover Test Armorers Plate SP05865 GEN 1-5 | Direct fit — verified for this model and generation. |
| Glock 26 Gen 5 | Glock OEM Orange Rear Slide Cover Test Armorers Plate SP05865 GEN 1-5 | Direct fit — verified for this model and generation. |
| Glock 34 All | NDZ Conversation Heart Rear Plates | Direct fit — verified for this model and generation. |
| Glock 34 Gen 4 | Glock OEM Orange Rear Slide Cover Test Armorers Plate SP05865 GEN 1-5 | Direct fit — verified for this model and generation. |
| Glock 43 Gen 3 | NDZ Glock Rear Slide Cover Plate Thin Line Series | Direct fit — verified for this model and generation. |
| Glock 43X All | Techna Clip for Glock 43 43X 48 Concealed Carry | Direct fit — verified for this model and generation. |
| Glock 43X Gen 4 | NDZ Glock Rear Slide Cover Plate Thin Line Series | Direct fit — verified for this model and generation. |
| Glock 43X Gen 5 | NDZ Glock Rear Slide Cover Plate Thin Line Series | Direct fit — verified for this model and generation. |
| Glock 45 Gen 4 | Ghost Armorers Orange Half Slide Cover Plate Tool for Glock GEN 1-5 | Direct fit — verified for this model and generation. |
| Glock 45 Gen 5 | Glock Gen 5 Custom Rear Slide Plates | Browse range — no single SKU listed for this model. |
| Glock 48 All | Techna Clip for Glock 43 43X 48 Concealed Carry | Direct fit — verified for this model and generation. |
Choosing and fitting
For a carry gun, choose a plate that sits flush and has no sharp edges that will catch on a cover garment. Machined aluminium and steel plates outlast the polymer OEM part. If you are installing one yourself, control the spacer sleeve on removal — the firing pin spring is under tension and will launch the cups across the room if you let it.