BX-25s in a stock 10/22 — malfunction rate worth tracking?

Question

I ran 200 rounds through a stock 10/22 with factory 10-rounders, then 200 more with a single BX-25. Kept a notebook. Here's what I found.

Factory mags: 1 FTF (bad round, not the mag).

BX-25: 3 FTFs, 1 stovepipe. All failures clustered around rounds 18–24 in the magazine.

The BX-25 works fine for casual shooting. But if you're running drills where you need repeatable performance — par times, scoring runs, isolating your trigger work — the extra pressure on the spring and follower matters. It's a reliability tax.

I'd say yes, they cause *more* malfunctions in a stock gun, but "more" might mean the difference between 0.5% and 1.5% failure rate depending on your ammo quality and how you load it.

Better data: how many rounds have you run with each? What's your ammunition? Are the mags brand new or broken in? If you're serious about this, keep a notebook for 500 rounds of each. Don't guess. The answer is in the data.

Stock 10/22s aren't precision platforms anyway, so it might not matter for your use case — but it's worth knowing the cost.

Ben Rourke · Accepted Answer

Both of you are tracking the same problem from different angles. Caliber's right about feed lip geometry—that's the mechanical root. But here's what I see from running students through this exact setup: the malfunction cluster OP found at rounds 18–24 is actually predictable, and it tells us when the magazine stops being reliable for strings.

I've put about 800 rounds through BX-25s in stock 10/22s across three guns. The failure rate holds steady until round 15–16, then degrades noticeably. By round 20 you're looking at roughly double the failure rate versus the first 15. After round 22, I stop trusting it for scored work.

Here's the threshold that matters: if you're running drills where a single magazine has to feed more than 15 consecutive rounds cleanly, the BX-25 becomes a variable you're measuring instead of a tool you're using. It's not that it *can't* do 25—it can, most of the time. But "most of the time" isn't good enough when you're isolating trigger control or timing.

So my practical recommendation: use BX-25s for casual plinking and breaking in new ammo. For par time work, stick with factory mags, or load the BX-25 in two separate strings of 12 rounds each and swap between them. That keeps you under the failure threshold and gives you the capacity without the reliability tax.

If you want solid data, run your next 500 through factory only, track it, then report back. That baseline will tell you whether the ammo or the magazine is the limiter in your specific gun.

Leo Park · Answer

Your notebook approach is solid, but there's a mechanical detail worth isolating: feed lip geometry. The BX-25 uses a different feed lip angle and spring pre-load than the factory 10-rounder. That's the root variable, not just spring fatigue.

Magazine feed lips have tolerances. Factory Ruger mags are typically spec'd tighter on the up-angle. BX-25s run a slightly more aggressive lip spread to handle 25 rounds—trades mag-to-mag consistency for capacity. When you hit rounds 18–24, you're in the zone where follower tilt combines with that lip geometry to create occasional misalignment on the feed ramp.

Here's what changes the numbers: ammo roundness. If your test ammo had any variance in bullet ogive or case length, the BX-25's more aggressive geometry will expose it faster than a factory mag will. Load a box of Federal bulk vs. CCI standard velocity through the same mag and you'll see different failure clusters.

That said—your 1.5% failure rate with a BX-25 on ammunition that runs clean in the factory mag tells you the feed lip tolerance is the constraint, not the spring or follower. Keep running data, but also note: do your next 500 rounds with *consistent* ammo, same lot number if possible. That removes the ammunition variable from the equation and lets you measure the actual magazine contribution.

The cost is real. Whether it matters depends on your standard. For competition drills, I'd stick with factory mags or run multiple BX-25s and rotate them so no single magazine handles 18+ consecutive rounds in a string.

Roy Espinoza · Answer

I've been running the same test since February—500 rounds factory, 500 BX-25, tracked every round. My data aligns with what Ben's seeing.

Factory mags: one FTF at round 487 (bad primer, not the gun). Clean baseline.

BX-25: first 15 rounds, zero issues across all five strings I ran. Rounds 16–20, one FTF per mag. Rounds 21–25, two to three FTFs per mag, plus the stovepipe OP mentioned. I saw the same clustering.

What I isolated: I ran the same BX-25 three separate times with fresh springs (removed and reset the magazine spring between tests). Same failure pattern at the same round counts. That tells me it's not fatigue—it's geometry, like caliber.club said. The spring's doing its job; the feed lips just can't maintain consistent ramp geometry under that follower tilt at capacity.

So here's my working threshold: BX-25 is reliable under round 16. Above that, plan for a malfunction every 50–100 rounds. For dry fire and live fire drill work, I split my 25-round strings into 12 and 13, or I use factory mags for timed work and BX-25s for volume days.

The notebook's the tool. Ben's right—the magazine becomes the variable you're measuring if you run it past 15. Know that limit, and the BX-25 becomes useful instead of frustrating.