Mid 80's
The Invector Choke system was first introduced in 1983 and only available on Citori, BPS, and BT-99 models. Fixed choke barrels were still available as well. Please note that the Citori Lightning model wasn't introduced until 1988. All Citori Lightning models in 12, 16, and 20ga. were only available with the invector choke system (and still are). 28ga Lightning Citori's were still fixed choke only.
The 2 letters NX in the middle of your Browning Invector pump action shotgun indicates that it was made in the year 1993.
Yes certainly it can with barrels intended for steel. It is generally not reccomended to shoot steel through Belgian FN guns no matter the choke. If you have a Japanese made gun with the invector choke system it is likely ok, but not certain. Check the year and be certain that the (invector) choke is rated for steel. The best reccomendation is to consult Browning with the year your gun was made (by serial number) and the barrel markings to identify the time period the barrel was made. They are best suited to recommend a safe answer to this question. Auto5man
Introduced in 1973, the Citori was the first Japanese made Browning. Fixed chokes were the only option until the Invector choke became available in 1983. The fixed chokes and Invectors were both available on the Citori for a few years until in 1989 when the Invector became standard on all guages except the 28ga and .410.
These Japanese made A5's were selling from $800-$1200 this past year.
Your gun was made in 1963. Use the link below to determine choke.
1965 if it is an auto-5. There should be markings on barrel to indicate choke.
13 yrs old. 800-1000 USD
Look and see if your Browning double auto has a number ahead of the letter A or 2 numbers ahead of the letter A.This is needed to establish the year of production.No Browning double auto could be ordered with a Polychoke,this would have been a after market installation.
This gun was made in 1947. The poly choke is not original and decreases value.
No way to date without the sn. No way to value without a detailed description of the overall condition, finish, accessories, etc..