Bsa experts - the rb1 breech?

[Hsing-ee]

I've probably asked this one before, but I have forgotten the answer.

Why did BSA not go ahead with the RB1 roller-breech?

The taps on the Lincoln Jefferies design needed hand-fitting and look a right old faff to turn up.

The roller-breech would surely have been an easier, faster design to make? As well as being more efficient as a direct-load system.

In general I cannot see why the sliding breech system was not adopted sooner and instead of the rubbishy old tap system.

I mean if the Chinese Communist industry of the 1970s could make the sliding-breech Lion after a quick look at the Anschutz, realising this was a cheap and easy way of making a fixed barrel rifle for low cost, then why the blazes did no one in Germany, Britain or Czechslovakia realise the same thing 50 years earlier?

WHY WHY WHY????

[evert]

Why did BSA not go ahead with the RB1 roller-breech?

-it requires two sliding O-rings to seal properly without beeing mechanically compressed before the piston starts to move
-has a too long transfer port
-the barrel needs an oversized breech taper because you dont get proper access to seat pellets with your thumb

[les allam]

I like the RB1 breech on my Superstar rifles.
I do find the .177 version a bit more awkward,with the pellets facing the wrong way on occasion.
A nice safe system .
Les..

[Geezer]

What’s an RB1?

I thought the RB Airsporter, Superstar and maybe some Gamos were RB2?

Which does beg the “what was an RB1?” question.

[Hsing-ee]

What’s an RB1?

I thought the RB Airsporter, Superstar and maybe some Gamos were RB2?

Which does beg the “what was an RB1?” question.

RB1 was the very early roller-breech patented by BSA in the early part of the 20th century. I don't know if any prototypes were made or if it just stayed as a paper idea.

The RB2 is the modern one as used on the SuperStar, the Airsporter RB2 and the Firebird PCP.

I had a Firebird PCP for a short time, the breech worked well on it once the barrel was seated correctly (thanks to advice from John Bowkett, who I think designed it) and it was very accurate.

[Geezer]

RB1 was the very early roller-breech patented by BSA in the early part of the 20th century. I don't know if any prototypes were made or if it just stayed as a paper idea.

The RB2 is the modern one as used on the SuperStar, the Airsporter RB2 and the Firebird PCP.

I had a Firebird PCP for a short time, the breech worked well on it once the barrel was seated correctly (thanks to advice from John Bowkett, who I think designed it) and it was very accurate.

Thought it was something like that.

And, yes, JB designed the Firebird and the Spitfire.

I’m guessing that if you were BSA in 19-not much and had tooled up to produce the LJ, and demonstrated it with approval at Bisley to King Edward VII or whoever, and told everyone it was a Tesla to everyone else’s Morris Minor that your inclination to change then would be about zero?

But, yes, pity that it took them about a decade or two from the first direct-breech guns to try one of their own.

[Hsing-ee]

-it requires two sliding O-rings to seal properly without beeing mechanically compressed before the piston starts to move
-has a too long transfer port
-the barrel needs an oversized breech taper because you dont get proper access to seat pellets with your thumb

Yes, I think the design pre-dates the 'O' ring so maybe air losses were considerable. BSA barrels always seem to have a fair bit of lead or taper on them in the breech, unlike the German offerings.